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.
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![](https://blackdiamond-cms.zaneray.com/cms/images/adc199f8-70ce-418e-855f-8bd90dfd0dcb_Christian+Adam_20201002_19504.webp?auto=compress,format&rect=329,0,960,1171&w=360&h=439)
Fantastic Jacket
"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
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Light, warm, and breathes well
"I tested the Vision Hybrid Hoody in Park City under my Mission Shell with only a base layer. Felt like I had nothing on except my base layer and shell. Great fit and finish. Kept the warmth I needed and shedded the rest." -SOCompton Verified Reviewer
![](https://blackdiamond-cms.zaneray.com/cms/images/a76bdfa9-ae13-4dd2-8f29-22e81c97ec15_Bob+Plum_23.5.25.BDLittleCottonwood0005.webp?auto=compress,format&rect=479,0,960,1171&w=360&h=439)
Active Insulation for Women
Discover allActive Insulation for Men
Discover all![The Coefficient Collection](https://blackdiamond-cms.zaneray.com/cms/images/ffed8722-c0dd-4fb3-9289-8c9705f3439c_Chris+Burkard_Iceland_2121_021627.png?auto=compress,format&rect=0,362,2048,1000&w=860&h=420)
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.
Women's Coefficient
Discover nowMen's Coefficient
Discover now![Skier climbing a ridge with skis on back](https://blackdiamond-cms.zaneray.com/cms/images/9047f1e4-7c39-47fd-b8f6-4d3b770fe867_email-bg-background-mod.jpg?auto=compress,format)
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