Maximum warmth in a GORE-TEX® garment that is waterproof, windproof, durable. New GORE-TEX® face fabric is supple and moves quietly. Lightweight, radiant Coreloft™ insulation delivers rich warmth that is almost weightless. Lighter weight insulation is used in the underarm gussets to reduce bulk and aid ease of motion. Pocket placement is thoughtful, thorough. Details of the Fission SV Jacket attend to comfort in cold environments with easy adjustment toggles and cords.