Thanks to Fusion Control technology, the glove lining and top layer form a waterproof entity that breathes better than many waterproof materials. The structure also gives a good feel to the handlebars, brakes and gear levers. Waterproof SealSkinz gloves are a great choice for wet and cold weather cycling, paddling, hiking and general outdoor use. The manufacturer's words "extreme cold" should be interpreted remembering SealSkinz is a Brittish brand. In practice, these gloves thrive around the freezing point. - The palm side is genuine leather: a durable, material with great grip - Primaloft Gold BIO insulation on the backhand side - Primaloft Gold insulation on the palm side - The fabric on the back of the palm is 50% polyester, 40% leather and 10% elastane - Lining fabric is 84% merino wool, 14% nylon and 2% elastane This product used to be called "Waterproof Extreme Cold Weather Insulated glove with Fusion Control".