should go strictly from a heel, avoiding «moving» foot.
2. A sole
should repeat the form stops or the form of footwear for convenience of wearing and increase of service life of a finished article. The sole should be strong and single-layered in order to prevent sliding and friction of a layer about a layer. The material of a sole should be sterilized (to not change the properties at repeated processing).
3. Fixing.
Fixing elements should adjoin densely to a leg or footwear of the operator, to be convenient in use (to not stir at walking to not rub a leg, etc.).
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