The Fission SV has been the toughest, warmest & most waterproof jacket from Arcteryx for years & this season sees it re-designed to make it more comfortable, stronger & just better. The Fission SV features a new Gore-Tex Pro outer shell with reinforced 3 layer fabric across the main abrasion areas with a lighter more breathable 2 layer Gore-Tex Pro fabric. Both these fabrics have a softer feel & move quietly to eliminate that annoying Gore-Tex rustle. Insulation is provided by their own Coreloft synthetic fibres which is zoned to optimise performance. Coreloft 100 g/m² is used under the arms to increase movement & increase breathability, whilst Coreloft 140 g/m² is used in the rest of the construction to maximise warmth. The benefits of Coreloft insulation is that it resists compression better than down, it is durable & resilient, & should the jacket become soaked, it will retain warmth & dry quickly. A fully insulated & helmet compatible Drop Hood provides essential protection & is attached to an insulated high collar. When not required the hood drops out of the way leaving the high collar to provide warmth & seal out the wind. There are also plenty of storage options with two chest pockets, two hand pockets & two internal mesh pockets. All external pockets use Water Tight zips & the main zip has a Water Tight Vislon zip all of which are highly water resistant but not completely waterproof. Arcteryx have applied their genius E-3D patterning which uses clever design & construction techniques to improve the fit, enhance mobility & reduce overall weight. The end result is that the Fission SV feels fantastic on giving you a real sense of comfort & protection. The Fission SV is the perfect all mountain jacket in hostile conditions or less strenuous activities when you just need the best protection available. Waterproof Breathable Insulated Micro-seam allowance (1.6mm) & tiny GORE seam tape (3 mm) reduces bulk & weight One-hand adjustable drawcords Articulated elbows Expedition with e 3D fit for easy layering, svelte profile & functional articulation Helmet compatible Drop Hood Insulated hood Integrated fitted collar panel for added warmth & comfort Laminated chin guard Water Tight external zippers Water Tight Vislon front zip Zipper garages to protect zipper closure from snow & rain Die-cut Velcro cuff adjusters reduce bulk, & wont catch or tear off Waist drawcords are routed to the inside of the pockets Adjustable waist drawcord Drop back hem Adjustable hem drawcord Full seat coverage Two hand pockets with laminated zippers Two internal mesh pockets Two chest pockets with laminated zippers Reinforced shoulders, arms & hips