MISSION Cooling Helmet Liner skull cap – Black, UPF 50 & Instant Cooling when Wet

The MISSION Cooling Helmet Liner is a lightweight, ventilated skull cap that cools instantly when wet, fits under helmets and hardhats, and offers UPF 50 sun protection.

Designed for athletes, outdoor workers, and anyone who wears head protection, this skull cap uses a reusable, chemical-free cooling fabric that activates with water. It reduces surface temperature quickly, fits comfortably beneath helmets and hats, and is machine washable. The mesh crown and feather-light construction balance breathability and coverage so you stay drier, cooler, and more focused during activity.

How quickly will the liner cool after I wet it?

When activated with water, the fabric delivers an immediate cooling sensation. A simple three-step activation — wet, wring, and snap — triggers the material to drop in temperature within seconds and keeps a cooling effect for up to about two hours depending on conditions.

• Instant cooling in under 30 seconds after activation
• Lasts up to approximately 2 hours per activation
• Reusable with no chemicals that wash out

Will it fit under my helmet or hardhat without slipping or bunching?

The liner is cut to fit snugly like a skull cap so it stays in place under helmets, bike caps, and hardhats. Its low-profile design keeps padding and fit intact while its ventilated crown encourages airflow and reduces bulk.

• Feather-light fabric sits flat beneath helmets
• Ventilated mesh at the crown enhances breathability
• Designed to keep sweat away from eyes without altering helmet fit

How do I care for the helmet liner and will the cooling last after washing?

The cooling technology is permanent and chemical-free, so it won’t degrade with normal laundering. Machine-wash the liner and it will retain its cooling performance — simply rehydrate and snap to reactivate the cooling whenever you need it.

• Machine washable and reusable
• Permanent cooling fabric that won’t wash out
• Easy reactivation by wetting, wringing, and snapping

What activities is this liner best suited for?

The cap is built for any situation where head cooling, sweat control, or sun protection helps performance or comfort. It works well beneath sports helmets, motorcycle helmets, work hardhats, and during solo activities when you want lightweight cooling and UPF coverage.

• Under helmets for cycling, football, lacrosse, and motorsports
• Outdoor work like construction or landscaping beneath hardhats
• Solo training: running, CrossFit, hiking, and general exercise

Who is this for? The MISSION Cooling Helmet Liner is aimed at people who need fast, reliable cooling under headgear — athletes, outdoor laborers, and recreational adventurers who want a breathable, low-profile layer that manages sweat, reduces perceived heat, and adds UPF 50 sun protection. If you wear a helmet or hardhat regularly and want a washable, reusable way to stay cooler without sprays or gels, this liner is a practical addition to your kit.