Polaris Cranium helmet liner review£15.00

Scalp-warming ultra-thin hat

BikeRadar score4/5

Super-ventilated helmets are all well and good in the height of summer, but as winter approaches keeping your head warm becomes more important. This super-thin hat is designed to fit unobtrusively under your lid.

It’s made of stretchy fleece on top, with windproof panels over the forehead and ears, and it’s shaped to fit snugly over your ears. It’s very effective without being too hot, which is a problem we’ve had with some similar hats.

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