Here's what other sites are saying:
Keep your hands warm and dry on winter adventures in these REI Down mittens. They feature polyester shells, waterproof and windproof inserts, and goose down insulation. Polyester shells are flexible yet durable; polyurethane palm and thumb reinforcements increase abrasion resistance and improve grip. Waterproof, windproof polyurethane inserts are built into the mittens to keep moisture out and protect the down insulation. Insulated with 650-fill goose down and ThermaDry polyester fibers for excellent warmth. Polyester microfleece linings wick moisture away from hands so they don't get clammy during high-energy fun in the snow. Webbing-and-buckle fastening systems at the wrists secure the fit. REI Down mittens have easy-to-cinch gauntlet cuffs that keep snow out and warmth in.