These are Columbia Minx Shorty Omni-Heat snow boots. Omni-Tech is a waterproof and breathable technology developed by Columbia. It minimizes stuffiness from intense exercise and prevents water from entering from the outside. It combines functionality and design, and is cost-effective, so it is used in many of Columbia's waterproof items, such as rainwear and waterproof sneakers. Omni-Heat: A thermal insulation technology developed based on NASA's spacesuits, with an aluminum dot lining that reflects body heat and keeps the inside of the wear warm. *I believe there are no noticeable scratches or stains, but there may be signs of use, storage scratches, and sole wear. *Please understand that these are used items and only purchase if you are okay with this. Please refrain from purchasing if you are sensitive to these details. Insole height: Approximately 2cm [Brand] Columbia [Condition] No noticeable scratches or stains [Size] 23cm [Color] Gray系 (gray-based) *Ready to ship immediately.