Power Stretch Pro is an excellent fabric with a smooth nylon outer that resists abrasion and keeps out light winds, and a soft, brushed polyester inner that pulls moisture away from the body. It works well as both a mid layer and, in really cold weather, a base layer. The fabric is very stretchy and the Aconcagua is body-hugging without restricting movement. It’s warmer than Polartec 100 so this is a warm garment for the weight, which is quite low. The design is simple with just a high collar, thumb loops and a roomy chest pocket. The Aconcagua is comfortable to wear and efficient at wicking. However it is expensive and doesn’t have handwarmer pockets or a hood. I’d only choose it as a cold weather base layer. For a fleece mid layer I’d rather have a garment with more features such as the Mountain Equipment Shroud or more warmth such as the Berghaus Scorch or EDZ Yeti, all fleeces that cost considerably less than the Aconcagua.
Pros: fast-wicking, warmth, light weight
Cons: expensive, no handwarmer pockets
MATERIALS: Polartech Power Stretch Pro HOOD: no FRONT CLOSURE: full-length zip with internal flap POCKETS: 1 chest CUFFS: elasticised, thumb loops SIZES: men: S-XXL, women: XS-XL WEIGHT: 366g COUNTRY OF ORIGIN: Portugal PRICE: Ј120 WEBSITE: mammut.ch