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Summit+ exclusive
Pro Thermal 3 Skully - Men's
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Trap the heat right where you need it with the Pro Thermal 3 Skully
What Our Gearhead® Experts Are Saying:
"I wear this under my helmet on every ride where the morning starts near freezing, and it never feels bulky or tight. Once the sun comes up and I've warmed into the ride, it's thin enough that I don't even think about it anymore."
A cold head takes the fun out of an early start faster than almost anything else, and Castelli built the Pro Thermal 3 Skully to fix that without adding bulk under a helmet. We love how the soft, stretchy Thermoflex fabric hugs close to the head, trapping warmth right where a rider needs it most before the day has a chance to warm up.
Details
- Thermal skully built to trap heat under a helmet
- Thermoflex fabric stays warm, soft, and stretchy against skin
- Flat lock stitching prevents chafing on long rides
- Reflective detailing on back adds visibility in low light
- Item #CSTZ85T
- Material
- Thermoflex
- Adjustability
- fitted
- Activity
- bike
- Manufacturer Warranty
- limited 2 year
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Frequently Asked Questions
How should the Castelli Pro Thermal 3 Skully fit beneath a cycling helmet?
Its stretchy Thermoflex fabric and fitted profile are designed to sit close beneath a cycling helmet. Choose the size using head circumference and the product page’s size chart, then make sure the cap does not disrupt your helmet’s fit.When is the Castelli Pro Thermal 3 Skully useful for riding?
It adds a warm, soft layer for cool-to-cold rides in generally dry conditions, including road, gravel, mountain-bike, and commuting outings. Reflective detailing at the back helps with visibility in low light.How does the Castelli Pro Thermal 3 Skully differ from a regular cycling cap?
This is thermal headwear designed to fit beneath a helmet, rather than a traditional cycling cap worn on its own. Thermoflex fabric adds warmth and stretch, while flat-lock stitching helps reduce irritation under a helmet.How do you set up the Castelli Pro Thermal 3 Skully with a helmet?
Pull it on so it sits smoothly over your head and ears, then put on your helmet and check that the cap has not shifted or bunched. Its low-profile design is intended to avoid interfering with helmet fit.How should you care for the Castelli Pro Thermal 3 Skully?
Machine-wash gently in cool water with mild detergent; avoid bleach, fabric softener, ironing, and high heat. Air-dry fully before storing it clean and dry.