A piece with breathable insulation which moves excess heat and moisture through a combination of air permeable fabrics and insulation the Arc'teryx Proton LT Men's Hoody is ready to manage the challenges of high energy pursuits in winter cold. A self-regulating mid layer for a variety of high output activities the Fortius™ Air 20 face fabric has an unrivaled hardwearing durability, this is over 60 times more durable in abrasion tests than the industry standard0 talk about a fabric that can take on even your lifestyle! This is filled with Coreloft™ Compact 80 synthetic insulation in the body, a material that maintains excellent stretch recovery to keep its loft mile after mile. For venting there is a No Slip Zip™ which keeps the main zipper from self-opening when you’ve gapped it half way down. Top it all off with a helmet compatible insulated hood for added warmth when you need it and you’ve got the essential synthetic layering piece for dynamic days out in the cold.