UGG Men's Felton boots are cold-weather rated waterproof boots designed to withstand low temperatures as -20 C (or -4 F) they can handle any cold-weather condition, made of waterproof full-grain leather features a7mm curly UGGpure wool liningto keep your feet warm and dry, a microfiber collar and a cushioning foam insole also presents an exclusive Vibram outsole to enhance traction.