Used one season. GUC. Kamik Rocket Snow Boot, color "Navy." Purchased from Backcountry. This is the only brand of boot I will purchase for my son, keeps him warm, great quality! The Kamik Rocket Boot features the removable Zylex liner, which uses a wicking layer next to the foot to handle sweat and felt thermal foil layers for heat retention. Synthetic and rubber shell blocks snow and slush. Snow collar with bungee lock helps keep wetness out during all-out snowball fights. Patterned lugs on outsole boost traction. Kamik rates this boot to -40F (-40C)