Sophisiticated waterproof, down insulated GORE-TEX jacket for cold days on-areaCoreloft Developed by Arc'teryx, Coreloft is a synthetic insulation made of staple fibres in mixed sizes that are crimped to trap air and retain warmth. The advantages of Coreloft is durable and resilient. Retains its warmth in humid and wet conditions and dries quickly if wet. Easy to care for.GORE-TEX Best for continuous, low to mid intensity activity. Breathable, durable, completely waterproof. Multiple fabrics and construction methods include insulated, non-insulated, 2-Layer with PACLITE Technology, 3-Layer with Softshell Construction, and 3-Layer with Tricot TechnologyDown Down is the premium cold, dry weather insulation material. Advantages include highest warmth to weight ratio. Comforms closely to the body trapping heat closer to your core and is highly compressible.Athletic Fit "Arcteryx Standard" fit, these complex patterns utilize anatomical shaping and gussets to enhance motion and eliminate excess bulk.