Vaporex: For additional warmth in cold weather boots and footwear, Propet's Vaporex insole has been designed, which retains heat by using a foil backing and insulating materials to keep feet warm in the most inclement weather; Removable Footbed: These styles feature footbeds that can be removed to accommodate custom orthotics; Scotchgard: Shoes featuring Scotchgard's protective treatment means these styles are water repellent and resist stains; 3M Thinsulate: Thinsulate insulation is made with fibers that absorb less than 1 percent of their weight in water. It's one of the lightest synthetic insulations on the market, and helps keep feet warm, even in damp conditions; Waterproof: Feet will stay warm and dry with these styles that have been specially designed to keep water out with their Sealtex bootie or laminate construction