Boys' Wholesale Ski Mittens. Grand Sierra™ Boys' Ski Mittens are designed to keep their little hands warm, dry, and comfortable when they’re playing outside in the snow and cold. Thanks to a waterproof lining and lightweight 3M Thinsulate™ insulation they’ll never suffer another moment of numb fingers during those fun snowman building sessions, sledding, or even the long walks to school in the winter and fall. - Shell: Woven Polyester - 3M Thinsulate™ insulation - Waterproof - Adjustable wrist strap - Reflective piping - Grip palm and thumb - Assorted colors 3M Thinsulate ™ Insulation is made up of finer fibers than other synthetic or natural insulation and is able to trap more body heat in less space keeping your customer's hands warmer!