Finding the right layers for high-output activities can be tough. You overheat on the skin track only to freeze on the summit. The belay is warm, but your lead is a hot mess. We get it. From pre-dawn starts to headlamp descents, our midweight active insulation pieces are the ideal solution for shoulder season warmth and stop-and-go pursuits in cool to cold conditions.
By utilizing cutting-edge technology like PrimaLoft Gold Insulation with Cross Core (used in NASA-developed space suits), and best-in-class materials (Japanese liquid crystal polymer ripstop), these layers provide warmth when you need it, plenty of stretch, and unparalleled breathability when it’s go time. In addition, we’ve maintained a warmth-to-weight ratio that’s optimized for dynamic adventures in the mountains.
"I have been using the First Light Stretch Hoody in cold mornings during trail rides/hiking and it does a great job at keeping me warm, layers very well." -Josh P. Verified Buyer
The Coefficient Collection
Our ultimate, award-winning mid-layers, the Coefficient fleece collection is ready for the mountains. Built with Polartec® Power Grid® fleece designed for high output activities, the Coefficient breathes while on the move, and wicks moisture when things heat up. The minimal slim-cut profile layers easily and added features like an under-the-helmet hood make the Coefficient hyper-versatile for any mountain adventure.