Power Wool™ Skull Cap

tremendous utility in a minimal package

By isolating plush merino wool on the inside, Polartec® Power Wool™ harnesses its superior climate and moisture control. A unique exterior construction dramatically improves its resilience, while remaining soft, supple and breathable. 

• the performance skully that's not limited to being an under-helmet liner
• calibrated for a full range of usage options: the high-stretch design layers over a cap or balaclava, under a helmet, and stays secure at high speeds without goggles
• single-layer, distinguished by a sleek external hem design that keeps only the merino wool side next to skin
• ultralight (24 g) and packs down small, fitting within the palm of your hand

Merino wool's marvelous climate regulating properties evolved from the dramatic temperature variation the sheep endure, making for headwear that can stand up to extreme cold without being uncomfortable in warmer conditions. Its superior hygroscopic structure also manages moisture more effectively than any other fiber, absorbing up to a third of its weight without feeling damp.