The Mammut Aconcagua Pullon is simply one of the best midlayer fleeces you can buy. Made from tough nylon faced Polartec Powerstretch Pro (not to be confused with the softer polyester faced versions) the Aconcagua can handle some serious abuse & provide fearsome warmth without getting overloaded with sweat. The bi-component fabric has a soft pile inner fabric to wick moisture away from your skin, & a tough nylon smooth outer fabric that disperses moisture & dries incredibly quickly. The addition of Elastane to the fabric gives the Aconcagua gives superb stretch for freedom of movement & a body hugging fit to optimise performance. The Aconcagua is very popular with those looking for high performance, warmth & durability from their ki Very robust & abrasion resistant Polartec Powerstretch Pro with nylon face Durable & fast drying Soft luxurious warm inner Bonded front pocket Thumb loops Body hugging fit