MISSION Cooling Helmet Liner — White, instant water-activated cooling & UPF 50, low-profile fit under helmets

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

Stay cooler during long shifts, rides, or workouts with a liner built to be activated by water and reused again and again. The fabric uses a permanent, chemical-free cooling technology that reacts within seconds when wet, and the slim, ventilated design slips under motorcycle, bike, and work helmets without bulk. It’s machine washable and made to support active days in sun, heat, and physical work.

How quickly does this liner cool and how do I activate it?

The liner cools within about 30 seconds of activation and can stay noticeably cool for up to two hours depending on conditions. Activation is simple and requires only water—no gels, sprays, or chemicals.

• Wet the liner thoroughly with water.
• Wring out excess so it’s damp, not dripping.
• Snap or shake to speed evaporation and cooling.
• Re-wet to renew cooling as needed throughout the day.

Will it fit under my helmet or hardhat without interfering?

Yes — the skull cap is cut slim and made from featherweight, ventilated fabric so it won’t add bulk or push your helmet off position. A ventilated crown helps airflow while the snug fit keeps sweat away from eyes.

• Low-profile design fits under motorcycle, bike, and work helmets.
• Stretch fabric conforms to different head shapes and sizes.
• Mesh panels at the top increase breathability under enclosed helmets.
• Thin profile prevents helmet pressure points and maintains proper fit.

How durable is the cooling effect and how do I care for it?

The cooling performance is built into the fibers and does not wash out, so the effect remains after repeated use and machine washes. Routine washing keeps the liner fresh without degrading the textile cooling action.

• Permanently integrated, chemical-free cooling technology.
• Machine washable — follow gentle cycle and air dry recommended.
• Reusable hundreds of times; reactivates simply with water.
• UPF 50 protection continues through normal wear and washing.

What activities is the liner best suited for?

The design is versatile for both work and play: wear it under hardhats for outdoor jobs, under bike and motorcycle helmets, or alone for running and training. It’s especially useful when heat or sun exposure can reduce comfort or performance.

• Construction, landscaping, roofing, and other outdoor work.
• Motorcycling, cycling, and other helmeted sports.
• Running, CrossFit, hiking, and team sports like football or lacrosse.
• Any hot-weather activity where sun protection and cooling help.

Who this is for: The MISSION Cooling Helmet Liner is made for people who need reliable, instant cooling without added chemicals or bulk — tradespeople and outdoor workers who wear hardhats, riders and athletes who require a slim helmet-compatible cap, and anyone who wants UPF 50 sun protection plus on-demand cooling during active work or workouts.