The Icebreaker Women's Quantum Vest is a merino wool midlayer for cold weather action. The Quantum is comprised of 260g of terry merino with 2% Lycra for lots of warmth and stretch. The temperature regulating qualities of merino keeps you warm without overheating by naturally wicking sweat away from your body. The chest pocket secures your mp3 player, wallet, or keys along with you on the trail. A Slim Fit allows for a base layer underneath and layering over top in even colder weather. Features of the Icebreaker Women's Quantum Vest Slim Fit Eyelet mesh underarm panels for maximum breathability Reflective centre-front zip for visibility Secure zippered chest pocket with media cord port Drop tail hem for added coverage Icebreaker reflective branding