| 摘要 |
A multi-layer insole for disposition in an article of footwear to insulate the foot from the cold developed in the sole and sock lining, if any, of the footwear from walking on a cold surface, the insole being sufficiently thin to fit in the footwear satisfactorily to the user without requiring any extra size of shoe, boot or the like and being highly effective in maintaining the foot warm in cold weather.
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