The whole jacket is constructed from Arcteryx own N80p-X nylon fabric which is incredibly durable & abrasion resistant. This textile is tightly woven to give a flat smooth face that sheds water amazingly well, reducing the amount of re-proofing required. Combine this amazing fabric with the new Gore-Tex Pro membrane & you get probably the best mountaineering jacket available today. Fully featured & virtually indestructible the Alpha SV is a long-term investment for serious end users who demand the best. Sleek & stylish by design, yet fully technical, it has been stripped to the barest essentials to reduce weight without compromising performance. Traditional bellows chest pockets sit high enough to avoid a climbing harness or pack belt, the hugely adjustable Storm Hood fits over any helmet yet can be cinched down with single handed cord adjusters & the ingenious Hem Lock inserts stop the jacket riding up when wearing a harness. The N80p-X fabric has taken over 5 years to develop & amazingly is softer & quieter than previous models while still retaining its outstanding durability. The Alpha SV just feels so good, the cut has been re-engineered with a reduced chest circumference, a closer anatomical fit. & articulated patterning for unrestricted movement. Gore-Tex Pro N80p-X fabric which is totally waterproof, highly breathable & durable Micro seam allowance to increase breathability Anatomical shape Articulated patterning for unrestricted movement Articulated elbows No-Lift underarm panels Fully helmet compatible Storm hood with laminated brim Laminated chin guard Water Tight external zips Pit zips for venting Water Tight Vizlon front zip Laminated die cut Velcro cuff adjusters Drop back hem Harness Lock inserts (removable) Sleeve pocket with Water Tight zip Twin high crossover hand pockets with laminated zips Two internal laminated pockets