OMM Mountain Core Smock

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The OMM Mountain Core Smock, with its PrimaLoft Active insulation and flexible nylon shell, offers warmth, breathability, and wind protection.

OMM says: 

Combining revolutionary PrimaLoft® Active insulation with our own lightweight and wind resistant Flexile shell, the Mountain Core Smock is an incredibly effective insulating layer that still provides excellent breathability during activities with variable output. The large through-pocket is the perfect handwarmer for before and after your early morning run. PrimaLoft® Active is built from a synthetic plume woven through a knitted mesh, offering the warmth of a fleece but with less than half the weight. With all the benefits of synthetic insulation, Core products work wet or dry with incredible wicking properties to ensure you won’t stay wet for long. Using the 125g/m2 weight of PrimaLoft® Active means 65% of the insulation is derived from recycled sources. The stretch nylon Flexile shell fabric has a high degree of wind and water resistance whilst retaining good breathability, perfect for mixed conditions. Pair with a shell in bad weather to increase the insulating benefits and protection.

Our Verdict

The OMM Mountain Core Smock is an innovative hybrid piece for active insulation that can keep up with your fast-and-light alpine missions. Combining OMM’s stretchy and weather-resistant Flexile nylon shell with PrimaLoft Active synthetic insulation, this smock strikes an impressive balance of warmth, breathability and wind protection. The PrimaLoft Active fill is woven into a highly air-permeable knit mesh, allowing superior thermal regulation even during high-output activities like scrambling and peak-bagging.

What sets the Mountain Core Smock apart is its thoughtful design, which is suited ideally for mountain pursuits. The large front pouch doubles as a cosy hand warmer or fleece-lined pillow for bivy stops. The quarter-length zipper makes venting easy. And the trim fit layers effortlessly under a shell in foul conditions. With over 60% of the insulation derived from recycled materials, the eco-conscious construction is another plus. For minimalist insulation that multitasks from cold ridgelines to blustery belays, OMM’s innovative Mountain Core Smock is an intelligent pick for weight-conscious adventurers.

– Reviewed by Ultralight Outdoor Gear

Features

• Stretch Panelling
• Wind resistant
• Warm when wet
• Large front fleece lined through-pocket reverses to form a fleece pillow
• Key clip
• YKK® quarter-length zip

Specifications

• Small weighs: 319g
• Medium weighs: 327g
• Large weighs: 352g
• XLarge weighs: 369g

Material & Construction

• Flexile: Nylon/Spandex mix
• 4-way stretch
• Breathable
• Quick drying
• Fast Wicking
• Wind resistant
• DWR: Durable Water Repellancy
• PRIMALOFT® ACTIVE 125g/m2
• 64% recycled insulation

Help & advice:

• The Ultimate Guide to Windshell Jackets
• Recycled Content in Outdoor Gear