MISSION Cooling Helmet Liner — Black skull cap, instant water-activated cooling, UPF 50 sun protection, slim fit for helmets

Designed for athletes, outdoor workers and anyone who needs fast relief from heat, this helmet liner uses a permanent, chemical-free cooling fabric that activates with water. It stays thin and breathable so it won't interfere with helmet fit or safety gear while providing cooling for extended activity. Machine washable and reusable, the liner is ideal for multiple uses across sports, trades, and everyday outdoor tasks.

How does the cooling activation work and how fast does it start?

Activation is simple and immediate: soak the liner, wring out excess water, then snap it to trigger the cooling effect. The fabric is engineered to lower sensation temperature quickly so you feel relief within seconds and cooling can last through periods of activity.

• Three-step activation: wet, wring, snap.
• Cooling begins in under a minute for fast comfort.
• Reusable—works again after drying and re-wetting.

Will it fit under my helmet or hardhat without changing the fit or comfort?

The liner is cut as a close-fitting skull cap to slide under most helmets, hardhats and headgear without adding bulk. Its feather-light fabric and ventilated crown maintain airflow and keep perspiration from running into your eyes while preserving a secure helmet fit.

• Slim profile designed for helmet compatibility.
• Mesh panels at the crown increase breathability and ventilation.
• Stretch fabric conforms to different head shapes for a snug fit.

Is the cooling technology safe and durable through washes?

The cooling effect comes from a permanent, chemical-free fabric treatment embedded into the fibers, not a topical finish that rinses away. You can launder the liner in a machine; the cooling properties persist through normal washing and routine use.

• Chemical-free cooling that won’t wash out.
• Machine washable and ready to reuse after drying.
• UPF 50 fabric offers sun protection during outdoor wear.

What activities and conditions is the liner best for?

This helmet liner is built for high-heat, active situations where cooling and sun protection matter. Use it beneath helmets for cycling, motorcycling, football, lacrosse, or under hardhats on job sites, and wear it alone for running, hiking, or training when you want quick cooling.

• Suitable for sports, outdoor work, and general hot-weather activity.
• Works for both helmeted activities and standalone cooling.
• Lightweight design keeps sweat controlled and improves comfort.

Who is this for? The MISSION Cooling Helmet Liner suits athletes, construction and utility workers, motorcyclists, and outdoor enthusiasts who need fast-acting, reusable cooling that doesn’t interfere with protective headgear. If you want a low-profile, machine-washable skull cap that stays cool after wetting and offers UPF 50 sun defense, this liner is built for that role.