Inner boots

An inner boot made of a thermoplastic plastic removably inserted into an outer boot for either skiing or snowboarding, the inner boot comprising:

• a bottom plate (10) that is disposed in the outer boot;
• and
• a foot wrap portion (20) that is formed at the bottom plate such that the foot wrap has a boot height designed for either skiing or snowboading, the foot wrap potion having a malleolus portion (28) that is to wrap a malleolus of a user, and a calf portion (29) that extends from an upper side of the malleolus portion and so as to go along a calf of the user, wherein:
• the inner boot is integrally formed with a single thermoplastic material wherein the thermoplastic material is foamed during only a single foam molding process such that the bottom plate and the foot wrap portion, which has the malleolus portion and the calf portion, are made as a single piece and another member is not disposed on either the malleolus portion or the calf portion of the foot wrap portion, and
• the thermoplastic material is a mixed resin that comprises a foaming agent and at least two types of ethylene vinyl acetate copolymer resins (or EVAs) that are a first EVA and a second EVA, both of which being comprised of ethylene and vinyl acetate wherein the foaming agent, the first EVA and the second EVA are present in a mixed state,
• the first EVA is contained in the thermoplastic material within a range from more than 0% to 28% by weight and
• the second EVA is contained in the thermoplastic material within a range from 4% to 13% by weight,
• each of the first and second EVAs contains ethylene and vinyl acetate at content percentages by weight and has a predetermined melt flow rate value (or MFR value) and a predetermined hardness,
• the content percentage of the ethylene in the first EVA is greater than the content percentage of the ethylene in the second EVA,
• the content percentages of the vinyl acetate in the first and second EVAs are ranged from 25% to 43%, and the content percentage of the vinyl acetate in the first EVA is smaller than the content percentage of the vinyl acetate in the second EVA by around 14% or more,
• the MFR values of the first and second EVAs are ranged from 7.0 g/10 min to 52.0 g/10 min, and the MFR of the first EVA is smaller than that of the second EVA,
• a product hardness of the inner boot is ranged from 33° to 43° when measured with an Asker C type durometer,
• the foaming agent is contained such that the foot wrap expands to reach the boot height through the single foam molding process.