JP2005000347A

JP2005000347A - Footwear

Info

Publication number: JP2005000347A
Application number: JP2003166111A
Authority: JP
Inventors: Hiromitsu Mera; 博光米良
Original assignee: EM SERVICE KK
Current assignee: EM SERVICE KK
Priority date: 2003-06-11
Filing date: 2003-06-11
Publication date: 2005-01-06

Abstract

<P>PROBLEM TO BE SOLVED: To provide footwear capable of preventing application of excessive loads on the first toe side at the time of kicking back and preventing and relieving such symptoms as the knee arthrosis and the hallux valgus by actively shifting the load applied on the first toe side to the fifth toe side at the time of kicking back. <P>SOLUTION: In the footwear, a part of the sole for receiving the part at least from the metatarsal bone head to the tip of the first toe is made of a material softer than the material of a part for receiving at least the metatarsal bone head of the fifth toe. A line a connecting a reference point on the heel side and the part for receiving the metatarsal bone head of the fifth toe and a line segment b connecting a heel side end part and the reference point on the heel side of the soft material formed part on a straight line passing the reference point on the heel side and the metatarsal bone head of the first toe has a relation: a>b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、膝関節症や外反母趾などの下肢疾患の治療および予防に用いる履物に関するものである。
【０００２】
【従来の技術】
人間は、起立時においては、図３に示すように、踵部Ａ、第１指中足骨頭部Ｂ、第５指中足骨頭部Ｃの３つの立脚点により体重を支えている。そして、歩行時においては、足部にかかる荷重は、着地時に踵部Ａ、続いて第５指の中足骨頭部Ｃと第１指の中足骨頭部Ｂに、ほぼ同時に移動する。そして、最後は、第１指の中足骨頭部Ｂに荷重が集中した状態で蹴り返しが行われる。なお、蹴り返しが第１指の中足骨頭部Ｂにおいて行われるのは、踵骨Ａ１と第５指の中足骨頭Ｃ１との距離よりも、踵骨Ａ１と第１指の中足骨頭Ｂ１との距離の方が長いため、蹴り返し時に、第１指の中足骨頭部Ｂが最後まで地面に接地しているからである。
【０００３】
ところが、骨格のゆがみなどにより、蹴り返し荷重が過度に足部にかかり続けると、外反母趾や偏平足などの下肢疾患を引き起こす上、その症状が悪化する原因にもなってしまう。そして、これらの下肢疾患による症状がひどくなると、歩行が困難になるなど重大な問題を引き起こすにもかかわらず、これらの下肢疾患に対して、効果的に予防したり緩和したりする手立てがなされていないのが現状である。
【０００４】
【発明が解決しようとする課題】
そこで、本願発明者は、膝関節症や外反母趾などの症状を極めて効果的に予防および緩和するために、次のような理論を打ち立てた。すなわち、まず、歩行時における荷重の移動方向に着目し、着地時に荷重のかかる場所と蹴り返し時に荷重のかかる場所とを結ぶ線を荷重線と定義した。そして、図７に示すように、踵骨Ａ１と第５指の中足骨頭Ｃ１とを結ぶ線を荷重線Ｋとし、踵骨Ａ１と第１指の中足骨頭Ｂ１とを結ぶ線を荷重線Ｌとした場合に、通常ならば最終的に荷重線Ｌを移動する荷重が荷重線Ｋを移動するように、蹴り返し荷重のかかる荷重線を変更させるべきであると考えたのである。
【０００５】
本発明は、上記の理論に基づき、蹴り返し時に第１指側にかかる荷重を積極的に第５指側にかかるようにすることにより、第１指側に過大な荷重がかかるのを防止し、膝関節症や外反母趾などの症状を予防および緩和できる履物を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
以上の目的を達成するために、請求項１記載の発明の履物は、
履物の底の、少なくとも第１指の中足骨頭部から指先までを受ける部分が、少なくとも第５指の中足骨頭部を受ける部分より軟質材料で形成されていて、
踵側の基準点と第５指の中足骨頭部を受ける部分とを結ぶ線分ａと、
踵側の基準点と第１指の中足骨頭部とを通る直線上にある軟質材料形成部の踵側端部と踵側の基準点とを結ぶ線分ｂとが、
ａ＞ｂの関係を有していることを特徴としている。
【０００７】
なお、踵側の基準点とは、履物の底において踵部を受ける部分の中心点のことをいうものとする。
【０００８】
【発明の実施の形態】
以下に、本発明にかかる履物の実施形態について詳細に説明する。
【０００９】
本実施形態の履物１は、図１、図２に示すように、底部２と、底部２の上部に一体に設けられる甲被部３とを備えており、底部２は、足型形状の底板部４と、底板部４の上面に敷設される中敷部５と、底板部４の下面全体に一体に設けられるクッション部６と、クッション部６の下面に被着される接地部７とを有している。
【００１０】
クッション部６は、硬さの異なるポリウレタン樹脂製の発泡材から構成されており、図２から図４に示すように、第１指側から、荷重を十分に吸収可能な柔軟性を有する第１クッション部６０１、第１クッション部６０１よりもやや硬めであるが、荷重を適度に吸収可能な柔軟性を有する第２クッション部６０２、歩行時の荷重を受け止めるとともに地面を蹴り返すのに十分な硬さを有する第３クッション部６０３が配置されている。
【００１１】
第１クッション部６０１は、幅方向には、第１指の中足骨頭部Ｂおよび第２指の中足骨頭部Ｄを受け止め、前後方向には、第１指および第２指の指先部分と土踏まずＧとを受け止める形状に形成されている。また、第２クッション部６０２は、幅方向には、第３指の中足骨頭部Ｆを受け止め、前後方向には、第３指の指先部分と土踏まずＧとを受け止める形状に形成されている。そして、第１クッション部６０１および第２クッション部６０２の踵側端部６０４は、図２に示すように、土踏まずＧの最も窪んだ部分よりも踵側に配置されており、踵側の基準点ｐと第１指の中足骨頭部Ｂを受ける部分の中心点ｑとを通る直線Ｎ上における第１クッション部６０１および第２クッション部６０２の踵側端部６０４との交点ｓと踵側の基準点ｐとを結ぶ線分ｂが、踵側の基準点ｐと第５指の中足骨頭部Ｃを受ける部分の中心点ｒとを結ぶ線分ａよりも短くなっている。
【００１２】
第３クッション部６０３は、幅方向には、第４指の中足骨頭部Ｆおよび第５指の中足骨頭部Ｃを受け止め、前後方向には、第４指および第５指の指先部分から足部の外側部位および踵部Ａ全体を受け止める略Ｌ字形状に形成されている。
【００１３】
本実施の形態の履物１によれば、まず、着地時から蹴り返し直前までの間、踵部Ａから足部の外側部分は、第３クッション部６０３で受け止められる。そして、蹴り返し時には、本来であれば、第５指の中足骨頭部Ｃ側から第１指の中足骨頭部Ｂ側へ自然に荷重が移動するのであるが、上述したように、第３指から第１指は、指先部分から土踏まずＧを含む部分までの範囲が、柔軟性を有する第１クッション部６０１および第２クッション部６０２で受け止められており、荷重が土踏まずＧにかかった時点で、荷重はクッション部６０１，６０２に吸収されているので、地面には蹴り返し荷重がほとんど伝わらない。
【００１４】
一方、第４指および第５指は、蹴り返し荷重を十分に地面に伝えることができる第３クッション部６０３で受け止められているので、蹴り返し荷重は、第３クッション部６０３にかかり、最終的な蹴り返しは、第４指の中足骨頭部Ｆおよび第５指の中足骨頭部Ｃで行われる。
【００１５】
以上詳述したように、本実施の形態の履物１によれば、蹴り返し時における第１指から第３指までの中足骨頭部Ｂ，Ｄ，Ｅの負担が軽減されるだけでなく、本来蹴り返し時に第１指側にかかる荷重を逃がして、蹴り返し荷重を積極的に第５指側に変更し、第１指側の中足骨頭部Ｂに過大な荷重がかかるのを防止するので、膝関節症や外反母趾などの症状の予防および緩和を図ることができる。
【００１６】
また、第１クッション部６０１および第２クッション部６０２の踵側端部６０４が、土踏まずＧの最も窪んだ部分よりも踵側に配置されているので、土踏まずＧに荷重がかかり始めた時点から荷重を逃がすことができる。したがって、土踏まずＧにかかる負担を効果的に軽減できるので、特に、偏平足の患者の負担を軽減することができる。
【００１７】
なお、各クッション部６０１，６０２，６０３の形状は、本実施の形態の形状に限られず、患者の症状に応じて適宜変更すればよい。そうすれば、症状の改善により効果的であるし、さらに、左右の足の症状がそれぞれ異なる場合等にも好適である。例えば、図５に示すように、第２クッション部６０２を、土踏まずＧ側においては幅広で指先に向かって先細となるように形成して、土踏まずＧを第２クッション部６０２で、第１指から第３指までの各中足骨頭部Ｂ，Ｄ，Ｅを第１クッション部６０１で受け止めるようにしてもよい。このようにすれば、第３指の中足骨頭部Ｅにかかる荷重が第１クッション部６０１に吸収されるため、第３指の中足骨頭部Ｅにかかる負担をより軽減できる。したがって、第３指の中足骨頭部Ｅにも症状がある患者にはさらに好適なものとなる。また、土踏まずＧが第２クッション部６０２で受け止められるので、第１クッション部６０１に荷重がかかった際の足部の沈み込みを軽減することができ、歩行時の安定性が向上する。
【００１８】
また、第１クッション部６０１および第２クッション部６０２の踵側端部６０４は、土踏まずＧの最も窪んだ部分よりも踵側であることが最適であるが、この位置に限定されるものではなく、踵側の基準点ｐと第１指の中足骨頭部Ｂを受ける部分の中心点ｑとを通る直線Ｎ上における第１クッション部６０１および第２クッション部６０２の踵側端部６０４との交点ｓと踵側の基準点ｐとを結ぶ線分ｂが、踵側の基準点ｐと第５指の中足骨頭部Ｃを受ける部分の中心点ｒとを結ぶ線分ａよりも短くなっていれば、踵側端部６０４が土踏まずＧよりも前方に位置していても構わない。
【００１９】
また、クッション部６の材質は、ポリウレタン樹脂に限られず、他の合成樹脂であってもよいし、コルクなどの木製素材であってもよい。また、発泡材に限られず、例えば各クッション部を中空状に形成し、内部に流動性物質を充填してもよい。さらに、第３クッション部６０３は、蹴り返しに十分な硬さを有していればよいので、金属で形成してもよい。
【００２０】
また、クッション部６の構成は、本実施の形態に限定されず、少なくとも第１指の中足骨頭部Ｂから指先までを受ける部分が、少なくとも第５指の中足骨頭部Ｃを受ける部分よりも軟質であればよい。したがって、例えば、硬さの異なる多数のクッション材を使用して、第５指の中足骨頭部Ｃを受ける部分から第１指の中足骨頭部Ｂを受ける部分に向かって多段階的に柔軟性が増すようにしてもよい。また、発泡効率の異なる合成樹脂を同一の型に別方向から流し込んで成型し、第５指側から第１指側に向かって無段階に柔軟性が増すようにしてもよい。このようにすれば、より自然な履き心地を得た上で第５指側への荷重の変更を図ることができる。
【００２１】
また、本実施の形態においては、クッション部６を底板部４と接地部７との間に設けたが、クッション部を設ける場所はこれに限られず、例えば、図６に示すように、クッション部６ｂを履物本体１０と別個に形成して、後から履物本体６ｂの内部に敷設して履物１ｂを構成するようにしてもよい。このようにすれば、足の症状の変化に応じて、クッション部６ｂを取り替えるだけでよいので、履物ごと新しいものに取り替える必要がない。したがって、使用者の経済的負担も少なく、ゴミの減量化にも貢献できる。
【００２２】
【発明の効果】
本発明の履物は、履物の底の、少なくとも第１指の中足骨頭部から指先までを受ける部分が、少なくとも第５指の中足骨頭部を受ける部分より軟質材料で形成されていて、踵側の基準点と第５指の中足骨頭部を受ける部分とを結ぶ線分ａと、踵側の基準点と第１指の中足骨頭部とを通る直線上にある軟質材料形成部の踵側端部と踵側の基準点とを結ぶ線分ｂとが、ａ＞ｂの関係を有しているので、蹴り返し時における第１指の中足骨頭部の負担が軽減される上、蹴り返し荷重を積極的に第５指側に変更し、第１指側の中足骨頭部に過大な荷重がかかるのを防止するので、膝関節症や外反母趾などの症状の予防および緩和を図ることができる。
【図面の簡単な説明】
【図１】本発明にかかる一実施形態の履物の外観図。
【図２】本実施形態における底部の縦断面図。
【図３】本実施形態におけるクッション部の底面図。
【図４】図３におけるＸ−Ｘ線断面図。
【図５】本発明にかかる別の実施形態の履物を示す説明図。
【図６】本発明にかかる別の実施形態の履物を示す説明図。
【図７】本発明における荷重線を示す説明図。
【符号の説明】
１，１ｂ履物
６０１第１クッション部（軟質材料形成部）
６０２第２クッション部（軟質材料形成部）
６０４踵側端部
ｐ踵側の基準点
Ｂ第１指の中足骨頭部
Ｃ第５指の中足骨頭部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to footwear used for the treatment and prevention of lower limb diseases such as knee arthropathy and hallux valgus.
[0002]
[Prior art]
When standing up, as shown in FIG. 3, humans support their weights by three standing points of the buttock A, the first finger metatarsal head B, and the fifth finger metatarsal head C. During walking, the load applied to the foot moves almost simultaneously to the heel A, and then to the metatarsal head C of the fifth finger and the metatarsal head B of the first finger at the time of landing. Finally, kicking is performed with the load concentrated on the metatarsal head B of the first finger. Note that the kickback is performed at the metatarsal head B of the first finger, rather than the distance between the radius A1 and the metatarsal head C1 of the fifth finger, the metatarsal head B1 of the rib A1 and the first finger. This is because the metatarsal head B of the first finger is in contact with the ground to the end when kicking back.
[0003]
However, if the kicking load continues to be excessively applied to the foot due to skeletal distortion or the like, it causes leg diseases such as hallux valgus and flat feet, and also causes the symptoms to worsen. And, if the symptoms of these lower limb diseases become severe, there are ways to effectively prevent or alleviate these lower limb diseases, despite causing serious problems such as difficulty in walking. There is no current situation.
[0004]
[Problems to be solved by the invention]
Therefore, the present inventor has established the following theory in order to prevent and alleviate symptoms such as knee arthropathy and hallux valgus extremely effectively. That is, first, focusing on the moving direction of the load during walking, a line connecting the place where the load is applied when landing and the place where the load is applied when kicking back is defined as a load line. Then, as shown in FIG. 7, a line connecting the rib A1 and the metatarsal head C1 of the fifth finger is a load line K, and a line connecting the rib A1 and the metatarsal head B1 of the first finger is a load line. In the case of L, it is considered that the load line on which the kickback load is applied should be changed so that the load that finally moves the load line L moves along the load line K.
[0005]
Based on the above theory, the present invention prevents an excessive load from being applied to the first finger side by actively applying the load applied to the first finger side to the fifth finger side when kicking back. An object of the present invention is to provide footwear capable of preventing and alleviating symptoms such as knee arthropathy and hallux valgus.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the footwear of the invention according to claim 1 is:
A portion of the bottom of the footwear that receives at least the first metatarsal head to the fingertip is formed of a softer material than a portion that receives at least the fifth metatarsal head;
A line segment a connecting the reference point on the heel side and the portion that receives the metatarsal head of the fifth finger;
A line segment b connecting the heel side end of the soft material forming portion and the heel side reference point on a straight line passing through the heel side reference point and the metatarsal head of the first finger;
It is characterized by having a relationship of a> b.
[0007]
The reference point on the heel side refers to the center point of the portion that receives the heel portion at the bottom of the footwear.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Below, the embodiment of footwear concerning the present invention is described in detail.
[0009]
As shown in FIGS. 1 and 2, the footwear 1 of the present embodiment includes a bottom portion 2 and an upper portion 3 integrally provided on the upper portion of the bottom portion 2, and the bottom portion 2 is a foot-shaped bottom plate. Part 4, insole part 5 laid on the upper surface of bottom plate part 4, cushion part 6 provided integrally on the entire lower surface of bottom plate part 4, and grounding part 7 attached to the lower surface of cushion part 6 Have.
[0010]
The cushion portion 6 is made of a polyurethane resin foam material having different hardness. As shown in FIGS. 2 to 4, the cushion portion 6 has a first flexibility that can sufficiently absorb a load from the first finger side. The second cushion part 602, which is slightly harder than the cushion part 601 and the first cushion part 601 but has the flexibility to absorb the load appropriately, is hard enough to receive the load during walking and kick back the ground. A third cushion portion 603 having a thickness is disposed.
[0011]
The first cushion portion 601 receives the metatarsal head B of the first finger and the metatarsal head D of the second finger in the width direction, and the fingertip portions of the first and second fingers in the front-rear direction. It is formed in a shape that catches the arch and G. The second cushion portion 602 is formed in a shape that receives the metatarsal head F of the third finger in the width direction and receives the fingertip portion of the third finger and the arch G in the front-rear direction. As shown in FIG. 2, the heel side end portions 604 of the first cushion portion 601 and the second cushion portion 602 are disposed on the heel side with respect to the most depressed portion of the arch G, and the heel side reference point An intersection s between the first cushion portion 601 and the heel side end portion 604 of the second cushion portion 602 on the straight line N passing through p and the center point q of the portion that receives the metatarsal head B of the first finger and the heel side A line segment b connecting the reference point p is shorter than a line segment a connecting the base point p on the heel side and the center point r of the portion that receives the metatarsal head C of the fifth finger.
[0012]
The third cushion portion 603 receives the metatarsal head F and the metatarsal head C of the fourth finger in the width direction, and from the fingertip portions of the fourth and fifth fingers in the front-rear direction. It is formed in a substantially L shape that receives the outer part of the foot and the entire heel part A.
[0013]
According to the footwear 1 of the present embodiment, first, the outer portion of the foot portion from the heel portion A is received by the third cushion portion 603 from the time of landing until just before kicking back. When kicking back, the load naturally moves from the metatarsal head C side of the fifth finger to the metatarsal head B side of the first finger, as described above. The range from the fingertip portion to the portion including the arch G is received by the first cushion portion 601 and the second cushion portion 602 having flexibility, and when the load is applied to the arch G, Since the load is absorbed by the cushion portions 601, 602, the kicking load is hardly transmitted to the ground.
[0014]
On the other hand, since the fourth finger and the fifth finger are received by the third cushion portion 603 that can sufficiently transmit the kickback load to the ground, the kickback load is applied to the third cushion portion 603 and finally The kick-back is performed at the metatarsal head F of the fourth finger and the metatarsal head C of the fifth finger.
[0015]
As described in detail above, according to the footwear 1 of the present embodiment, not only the burden on the metatarsal heads B, D, E from the first finger to the third finger at the time of kicking is reduced, Originally, the load applied to the first finger side at the time of kickback is released, and the kickback load is positively changed to the fifth finger side to prevent an excessive load from being applied to the metatarsal head B on the first finger side. Therefore, it is possible to prevent and relieve symptoms such as knee arthropathy and hallux valgus.
[0016]
Moreover, since the heel side edge part 604 of the 1st cushion part 601 and the 2nd cushion part 602 is arrange | positioned on the heel side rather than the most depressed part of the arch G, it is a load from the time the load begins to be applied to the arch G Can escape. Accordingly, the burden on the arch G can be effectively reduced, and in particular, the burden on the flat foot patient can be reduced.
[0017]
In addition, the shape of each cushion part 601,602,603 is not restricted to the shape of this Embodiment, What is necessary is just to change suitably according to a patient's symptom. If so, it is more effective in improving symptoms, and is also suitable when the symptoms of the left and right feet are different. For example, as shown in FIG. 5, the second cushion part 602 is formed to be wide on the arch G side and taper toward the fingertip, and the arch G is formed from the first finger by the second cushion part 602. The metatarsal heads B, D, and E up to the third finger may be received by the first cushion portion 601. In this way, since the load applied to the metatarsal head E of the third finger is absorbed by the first cushion portion 601, the load applied to the metatarsal head E of the third finger can be further reduced. Therefore, it is more suitable for patients who also have symptoms on the metatarsal head E of the third finger. Further, since the arch G is received by the second cushion portion 602, the foot portion can be prevented from sinking when a load is applied to the first cushion portion 601 and the stability during walking is improved.
[0018]
Further, it is optimal that the heel side end portion 604 of the first cushion portion 601 and the second cushion portion 602 is on the heel side with respect to the most depressed portion of the arch G, but is not limited to this position. , The first cushion portion 601 and the heel side end portion 604 of the second cushion portion 602 on a straight line N passing through the reference point p on the heel side and the center point q of the portion that receives the metatarsal head B of the first finger. A line segment b connecting the intersection point s and the base point p on the heel side is shorter than a line segment a connecting the base point p on the heel side and the center point r of the portion that receives the metatarsal head C of the fifth finger. If it is, the heel side edge part 604 may be located ahead of the arch G.
[0019]
The material of the cushion portion 6 is not limited to polyurethane resin, but may be other synthetic resin or wooden material such as cork. Moreover, it is not restricted to a foam material, For example, each cushion part may be formed in a hollow shape and a fluid substance may be filled inside. Furthermore, the third cushion portion 603 may be formed of metal as long as it has sufficient hardness for kicking back.
[0020]
Moreover, the structure of the cushion part 6 is not limited to this Embodiment, The part which receives from the metatarsal head B of a 1st finger to a fingertip at least from the part which receives the metatarsal head C of a 5th finger at least As long as it is soft. Therefore, for example, using a plurality of cushioning materials having different hardnesses, the softening is performed in multiple steps from the portion receiving the metatarsal head C of the fifth finger toward the portion receiving the metatarsal head B of the first finger. You may make it increase property. Alternatively, synthetic resins having different foaming efficiencies may be poured into the same mold from different directions and molded to increase the flexibility steplessly from the fifth finger side toward the first finger side. In this way, it is possible to change the load on the fifth finger side while obtaining more natural comfort.
[0021]
Moreover, in this Embodiment, although the cushion part 6 was provided between the baseplate part 4 and the earthing | grounding part 7, the place which provides a cushion part is not restricted to this, For example, as shown in FIG. The footwear 1b may be configured by forming the footwear 6b separately from the footwear main body 10 and laying the footwear main body 6b later. In this way, it is only necessary to replace the cushion portion 6b in accordance with changes in foot symptoms, so there is no need to replace the footwear with a new one. Therefore, there is little economic burden on the user and it can contribute to the reduction of garbage.
[0022]
【The invention's effect】
In the footwear of the present invention, at least a portion of the bottom of the footwear that receives from the metatarsal head of the first finger to the fingertip is formed of a soft material than at least a portion that receives the head of the metatarsal bone of the fifth finger. Of the soft material forming portion on the straight line passing through the reference point on the side and the portion receiving the metatarsal head of the fifth finger, and the reference point on the heel side and the metatarsal head of the first finger Since the line segment b connecting the heel side end and the heel side reference point has a relationship of a> b, the burden on the metatarsal head of the first finger when kicking back is reduced. Since the kickback load is positively changed to the fifth finger side to prevent an excessive load from being applied to the metatarsal head of the first finger side, symptoms such as knee arthropathy and hallux valgus can be prevented and alleviated. Can be planned.
[Brief description of the drawings]
FIG. 1 is an external view of footwear according to an embodiment of the present invention.
FIG. 2 is a vertical sectional view of a bottom portion in the present embodiment.
FIG. 3 is a bottom view of a cushion portion in the present embodiment.
4 is a cross-sectional view taken along line XX in FIG.
FIG. 5 is an explanatory view showing footwear according to another embodiment of the present invention.
FIG. 6 is an explanatory view showing footwear according to another embodiment of the present invention.
FIG. 7 is an explanatory diagram showing load lines in the present invention.
[Explanation of symbols]
1,1b Footwear 601 First cushion part (soft material forming part)
602 Second cushion part (soft material forming part)
604 heel side end p heel side reference point B metatarsal head C of the first finger C metatarsal head of the fifth finger

Claims

履物の底の、少なくとも第１指の中足骨頭部から指先までを受ける部分が、少なくとも第５指の中足骨頭部を受ける部分より軟質材料で形成されていて、
踵側の基準点と第５指の中足骨頭部を受ける部分とを結ぶ線分ａと、
踵側の基準点と第１指の中足骨頭部とを通る直線上にある軟質材料形成部の踵側端部と踵側の基準点とを結ぶ線分ｂとが、
ａ＞ｂの関係を有している履物。A portion of the bottom of the footwear that receives at least the first metatarsal head to the fingertip is formed of a softer material than a portion that receives at least the fifth metatarsal head;
A line segment a connecting the reference point on the heel side and the portion that receives the metatarsal head of the fifth finger;
A line segment b connecting the heel side end of the soft material forming portion and the heel side reference point on a straight line passing through the heel side reference point and the metatarsal head of the first finger;
Footwear having a relationship of a> b.