mont bell Exceloft Foot Warmer 1118505 Price: ¥4,950 Size: M There is no peeling of the non-slip material on the soles. This foot warmer uses Exceloft®, which is easy to care for and highly insulating. The drawcord adjusts the fit around the ankles, making it difficult to slip off during sleep or walking. The lining uses a brushed mesh fabric that is less likely to slip. The stretch material at the opening prevents cold air from entering. This item is suitable for cold weather protection in mountain huts, tents, during rest, and during sleep. =Outer fabric / 40-denier nylon taffeta, Lining / Climaplus® mesh [polyester], Insulation / Exceloft® [polyester] =Average weight: 245g From the Montbell website above