OMM Rotor Smock 

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OMM Rotor Smock 
235g (men’s M) 
theomm.com
£150

This lightweight, synthetic, insulated smock is designed to offer excellent warmth-to-weight and packsize in changeable race conditions. With cosy PrimaLoft Gold insulation and a tough yet lightweight water-resistant shell, it's great for mountain marathons and packs into its own zipped kangaroo pocket to create a pillow. 

Verdict: Great warm layer for mountain marathons or fast-packing.
9/10