Offcet center design to reduce the load on body It is said that when we stand barefoot on level ground, we can stand with toes outward in a stable. It is same also on slope. How about standing with skiboots? Usually when we stand with skiboots, we can stand with toes inward a little. And then the direction of knee flexion is the big toe. So we must rotate the knee inward constantly in order to make skis parallel. And the direction of knee flexion is inward on parallel ski. Such a symptom was a corollary on human foot skeleton, physiology and skiboots design.
The traditional ski technique which rotates the legs has no problem for the characteristic of such skiboots, because the turn of ski by traditional ski technique was by rotatation the knee. But such a performance of skiboots makes a disadvantage for the evolution of ski technique. On the latest ski technique, the direction of ski is determined by leaning legs with both feet load in order to turn using effectively side curve of ski. In such a skiing, the knee flex into the inside leads to power loss. And it creates heavy stress on the knees and legs by large resistance from snow surface. It is important for skiboots that the knee flex is same direction as skis.
The design of REXXAM to straighten the direction of knee flex to skis is the offset last. It creates the situation which the foot is facing outward naturally in skiboots. On the center of heel which the load is concentrated, it is designed as the last which the center line of foot is facing the outside. In other words, it creates the situation in skiboots that the toe is facing outward slightly when standing naturally. It is easy to make the skis parallel naturally just on wearing skiboots and to straighten the direction of knee flex. And as the front of knee receives the resistance from snow surface, the stress on legs is reduced for a long time skiing.
In the development of skiboots, REXXAM has conducted joint research with shoemeister in Austria as the home of shoes and completed A-One Concept.
The shoemeister says that he needs the adjustments in almost 90% on tune-up of skiboots. It is the necessary adjustment in order to put the foot correctly in skiboots and do a comfortable movement without disturbing the physiology of foot. It effectively locks the foot to move and improves the unnecessary pressure which leads to foot problem.
The ideal last design which was derived from many years of experience as shoemeister has incorporated into REXXAM for every minor change. A-One Concept is new last design which was born as the culmination of result. That is the skiboots which embody the thought of shuemeister considering the health of foot.
The shape of human foot is divided into the following three. The most common shape is Egypt type in about 70% that first finger is the longest. About 25% is Greece type that second finger is longer than first finger. About 5% is Square type that finger length is almost same and is called as the most appropriate foot for ballerina. But the most toe shape of skiboots is semicircular for top priority of design for fashionability and productivity. It doesn't fit human foot. The adjustment in 80% on tune-up of skiboots is the base of big and little toe. It would not be an exaggeration to say that the traditional skiboots were the design which ignored the foot shape of human.
When wearing tight shoe of toe, our parallel sense is dull.
When even athletes with high exercise capacity tightly bandage their toe, they can't walk the balance beam to cross over easily in an ordinary way. Let alone on skiing, in a state which the toe is strongly pressed inside, the direction of knee flex is not straight and it has negative effects for skiing. And also hallux valgus which women especially note as foot problem is caused by the mismatch of toe shape of shoe and foot.
In addition, according to the analysis of process for hallux valgus, it can sometimes be to hallux valgus from broard foot. As side arch of sole is low in broard foot, big toe tries to spread (varus). But as big toe can't spread on wearing shoes, it is bent to the center direction of foot on the joint part (valgus) and becomes hallux valgus. In any case, if the shoes toe is tight, there is a risk that leads to foot problem.
The last design of A-One Concept is the shape with an emphasis on human foot. REXXAM has applied the idea of prominent anatomist Meyer in 19th century to skiboots which emphasizes functional line of foot connecting center line of heel and big toe. This advantage is to lengthen big toe straightly. REXXAM designed the basic last which assumed Meyer line to cross the lines connecting the two points on the inside of heel and big toe base and connecting toe top. REXXAM realizes skiboots which can stick big and little toe out and is easy to take the balance during exercise.
The deep heel pocket design which gives a better fitting for the most important heel part in skiboots.
By designing high peak of heel, it is possible to keep the correct position for calcaneus, talus and ankle joint and to do knee flex correctly. Achilles tendon which do an important work in order to keep body balance constant in forward lean movement on skiing is the most sensitive part.
The excessive pressure leads to damage to achilles tendon itself. The peak position of heel prevents this pressure and numbness of foot.
Malleolus outside of talus is the joint which connects talus and tibia. So if talus as a base of malleolus joint is compressed from outside by shell, malleolus moves to the inside and it means to put a big stress on knee. Moreover, it interfares the correct skiing. In order to keep malleolus joint to the correct position, it puts flexibility into outside part of talus and reduces the stress to knee and makes possible easy skiing.
The upper part of navicular contains many large blood vessels. So if this part is compressed, the whole foot goes numb and it leads to reduce the sole feeling and excercise ability. Moreover, poor blood circulation to toe leads to cold toe.The design which puts flexibility into the part of navicular reduces the stress around dorsum of foot and prevents to go numb and cold toe.