OzeroÃ¯Â¾Â’s Winter Ski Mittens are perfect for hours of fun in temperatures as low as –40?F. ? Made with TR cotton, these mittens provide all-day warmth to your hands and delicate fingers. ? Complete with cowhide leather for windproof and water-resistant comfort, giving these thermal mittens superior durability. ? Perfect for both adult and child, these mittens will last through skiing, hockey, snow shoveling, snowmobiling and winter mountain climbing. Even with all of the warmth, our unique glove design is breathable to keep your hands from overheat. ? An elastic wrist keep the mittens securely on your hands to keep the warmth in roaring wind and snow out. Choose the perfect fit by measuring your hand circumference. Measure your dominant hand with a tape around the widest part of your palm where the thumb starts at the palm, not including the thumb. If you are between sizes or have a thick palm, choose the larger size. Medium: 8.46in (215mm) circumference Large: 9.86in (225mm) circumference X-Large: 9.25in (235mm) circumference Materials: Shell: Water-resistant Cowhide Leather Lining: TR Thermal Cotton Cowhide leather is not waterproof, JUST WATER RESISTANT. 100% SATISFACTION GUARANTEED We offer a 100% satisfaction guarantee. If the gloves are defective or damaged within 90 days, will replace it for you or provide a full refund so can feel confident purchasing with Ozero.