Giro Skullcap: Lightweight Under-Helmet Cap (£19.99)
The Giro Skullcap is a thin cap that sits under a cycling helmet. We have not tested it ourselves. This page collects the listed specs and the Tredz price.
Available now: Giro Skullcap — £19.99 at Tredz, correct at time of writing, 7 October 2026.
What the retailer lists
- Purpose: designed to be worn under a helmet, thin enough not to bunch.
- Fabric: X-Static performance jersey mesh top panel rated SPF 30, with power mesh side panels listed for staying cool and dry.
- Composition: 96% polyester, 4% X-Static fibre.
- Seams: smart seams listed as easing pressure points under a helmet.
Where it fits a triathlete’s winter
The points below are our reading of the listed specs, not test results.
- Shoulder-season rides. A thin mesh cap is a light layer for cool mornings, not a thermal one. For proper cold, look at a fleece-lined cap.
- Sweat and sun. The listing points to sweat management and SPF 30 on the top panel. We have not tested either.
- Helmet fit. A thin cap should not change how a helmet fits, but try it with the helmet you use before a long ride.
Where to buy
Tredz lists the Giro Skullcap from £19.99 at time of writing, and the link below goes to the same product page.
Related guides
See also our guide to the best winter cycling skull caps, the best cycling caps and the best winter cycling gloves.
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