Amazon.com: cH2O: MENS 880。Designed to work as hard as you do, these CH20 work boots keep feet dry, warm and comfortable with their waterproof construction and WarmBuilt® synthetic insulation; they also ensure steady traction with a Vibram® rubber outsole. DryBuilt® waterproof membrane WarmBuilt® synthetic insulation with Carbon Heat Shield that captures, radiates and reflects body heat without added bulk CH20FIT® dual-density molded gel insoles with antimicrobial memory foam Leather and textile upper Fabric lining Padded collar and tongue Kevlar® laces Rubber toe cap for added protection Compression EVA midsole for added cushioning and support Vibram® rubber outsole