Breathable warmth and retro styling, make the Mountain Shirt Jacket a versatile piece to see you through winter. The Ventrix™ insulation warms when you're at rest, yet breathes when you're on the move, so you'll stay just-right-warm whatever you're up to. Synthetic Insulation :40g Ventrix™Stretch Synthetic Insulation - Insulation reduces heat loss and increases warmth, even in the coldest temperatures.FEATURESStand-up collarSecure-zip chestpocketWelt hand pocketsReinforced patch on back of lower arms for added durabilityElastic binding on collar, front placket, cuffs and hemEmbroidered logo on chest pocketTECHNOLOGYVENTRIX™ INSULATIONVentrix™ technology features zonal perforations that open with movement allowing perspiration to escape, and remain closed in times of rest to retain heat.