When exploring your limits under tough conditions, the right layers can be the key that lets you push even further. This jacket is the inner layer of the Haglöfs Synchronized Performance Layering System. Designed with a vital combination of three Polartec® fabrics, it acts as the central engine to ensure rapid breathability and humidity transfer, while supplying a high warmth-to-weight ratio. You’ll also find helpful details like a snug collar to prevent spindrift entry and a security pocket.