Men's Smirr 3L Mountain Jacket
Men's · See the women's version
Rated 4.6 out of 5 4.6 (84)
£280
Cairnhope's lightest mountain shell, made for summer Munros and fast days on Skye.
Free click and collect from all 128 shops, usually the next day.
- Free delivery on orders over £50, next day for £6.95.
- 60 days to return anything unused.
- Water-repellent finish made without PFAS.
About this product
Smirr is Cairnhope's lightest mountain jacket, built for long summer days on the Scottish hills when the weather can still close in by afternoon. The Stormcairn 3L fabric uses a polyethylene membrane, rated to 20,000mm with a breathability of 25,000g/m²/24h, and the jacket weighs 330g in size M.
The hood fits over a helmet and has a laminated brim. Two chest pockets sit above a harness or hip belt, and the cuffs are cut long to cover glove gauntlets. Cairnhope designs and tests its shells in the Cairngorms and on Skye.
- Helmet-compatible hood with a laminated brim
- Chest pockets clear of a harness or hip belt
- Long cuffs to cover glove gauntlets
- PFAS-free polyethylene membrane
- 330g in size M
Specification
| Waterproof rating | 20,000mm |
|---|---|
| Breathability | 25,000g/m²/24h |
| Construction | 3-layer |
| Fabric | Stormcairn 3L, 30D recycled nylon |
| Weight | 330g (size M) |
| Hood | Helmet-compatible, laminated brim |
| Pockets | 2 chest |
| Fit | Athletic, room for a light fleece |
| Product code | WL1025 |
Materials
Face fabric 100% recycled nylon. Membrane polyethylene. Backer 100% nylon tricot.
Care
Machine wash at 30°C with a technical cleaner, then tumble dry low to reactivate the water-repellent finish.
Reviews
4.6 out of 5
84 reviews
Reviews on this demo are invented, like everything else here.
4 out of 5
Snug cut
Great fabric and it breathes well on Bleaklow. The cut is slim, so I went up a size to get a fleece under it. The orange is bright, as you'd want on the hills.
Dev, Glossop · 12 April 2026 · Bought size L, I'm usually M
5 out of 5
Light enough for the Cuillin ridge
Used it on two days of the Cuillin ridge in June when the cloud came in. Fits over a helmet and doesn't get in the way when climbing. Pricey, but I've not found anything this light that's this well cut.
Iain, Portree · 3 July 2025 · Bought size M, athletic fit
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