The Spyder Ladies Essential Ski Mitts in Black FEATURES Spyder Xt.L waterproof insert Over the cuff gauntlet Single-handed drawcord ThermaWeb (100g) Polyester Light Weight Sweater Knit Bonded to Anti-Pill Fleece TECHNOLOGY Thermaweb Spyder's ThermaWeb insulation contains ultra-fine polyester fibers that trap and hold body heat. Xt.L is an ultra-thin membrane that delivers superior waterproofing and breathability. This technology results in pliable fabrics that are lightweight yet durable. Xt.L benefits include stretch recovery, which maintains the integrity of the fabric. Even after seasons of use, it still looks great and performs at like-new levels. Spylon When the powder is deep you need all the dry you can get. Enter Spylon durable water repellent (DWR) finish, which retains 80% of waterproofness after 20 washings, and guards against water- and oil-based stains.