What do you get when you fuse luxury fabrics and revolutionary construction from a company that likes to push forward the evolution of outdoor apparel and set new industry standards' You get the Arc'teryx Men's Fission SL Insulated Jacket, an incredibly lightweight yet durable waterproof, insulated jacket that has evolved to thrive under hard and prolonged use in the harshest alpine conditions. It is the lightest weight waterproof, insulated jacket that Arc'teryx offers. Arc'teryx engineered the jacket's NP40p x face fabric to be incredibly durable and water repellent while remaining extremely lightweight. It's laminated it to a Gore Tex Pro fabric to create a highly breathable, lightweight, and durable waterproof fabric made for the most extreme conditions and use. Arc'teryx's Therma Tek insulation is treated with a DWR durable water repellent finish that keeps it from absorbing water if it's exposed to moisture. In an innovative construction process, the insulation is bonded to a tough nylon lining to create one consistent layer of warmth that leaves no cold spots that could otherwise be caused by insulation clumping. The jacket is sealed up by a high tech watertight Vislon 2 way front zipper that keeps water out without the need for bulky storm flaps, and allows you to open the jacket from the top or bottom for easy access. One handed drawcords at the hood and a drawcord at the hem allow you to cinch up, and the high collar on the hood, with soft brushed microsuede lining, provides full coverage to protect your neck and chin. Once you've battened down the hatches, you can always dump excess heat through the underarm zip vents. The hood is large enough to cover a ski or climbing helmet, and is designed to move with your head so you always maintain a full field of vision. The overall streamlined athletic fit and low bulk profile of the jacket, along with anatomical shaping, articulated elbows, and underarm gussets, support agile movement so you're not restric...