Silica Comfort "Anti-Sweat & Foot Odor Insoles". Size: 23.5-24cm Color: Black Odor-Eliminating Function: Eliminates 95% of ammonia, the cause of foot odor, in 1 minute, and 99% in 10 minutes. Also eliminates over 97% of isovaleric acid. Sweat Prevention Function: Reduces shoe humidity by over 30% compared to when not in use. The silica gel built into the insole absorbs foot sweat and moisture. Regeneration Function: Function is restored by drying in the sun. Can be used repeatedly. 【Effective in Any Shoe】 Because the main sole itself absorbs moisture. Prevents sweating in poorly ventilated shoes (leather shoes, safety shoes, boots, rain boots, etc.) that could not be addressed with mesh or perforated insoles. 【Reusable, Eco-Friendly & Economical】 Can be used for a long time because the function is restored by drying in the sun. More eco-friendly and economical than frequently replacing inexpensive insoles. 【Prevents Foot Odor】 Prevents odor by creating a humidity level that makes it difficult for odor-causing bacteria to multiply, thanks to the moisture-absorbing effect of silica gel. 【Prevents Tinea Pedis (Athlete's Foot) Propagation】 Recognized for its effect in inhibiting the propagation of tinea pedis, the cause of athlete's foot. (Does not kill tinea pedis and does not have a therapeutic effect on athlete's foot.) 【Size Variations for Everyone】 Available in sizes from 22.5cm to 29cm, recommended for those who couldn't use insoles before, such as those with 23cm or 28cm feet. No stains, tears, or odors.