Black Diamond

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.

Black Diamond photographer Christian Adam wearing the Coefficient LT Hybrid Hoody in Iceland.
The Black Diamond Coefficient LT Hybrid Hoody.
A climber wearing the Black Diamond Coefficient Hoody.

Coefficient and layers that pair

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Black Diamond Athlete Hazel Findley climbs wearing the Black Diamond Coefficient Hoody.
Watch: Black Diamond Athlete Carlo Traversi send the mythical Magic Line wearing the Coefficient hoody.

Technical midlayer insulation ideal for everything from chilly cragging days to big mountain missions.

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A skier zips up their shell Jacket wearing the Black Diamond Coefficient Hoody as a base/mid layer.
A climber wears the Black Diamond Coefficient hoody while climbing in Little Cottonwood canyon, UT.
A climber wears the Black Diamond Coefficient hoody while climbing in AZ.
A Skier boot backs up a mountain wearing the Black Diamond Coefficient Hoody.

A midlayer for anything from ski tours to alpine ascents

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