MISSION Cooling Helmet Liner — White skull cap for helmets & hardhats, UPF 50, instant wet-activated cooling

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

Stay active in heat without bulky gear: this skull cap uses a permanent, chemical-free cooling fabric that lowers surface temperature when soaked, wrung out and snapped. Designed to sit snugly beneath motorcycle, bike, or work helmets, it wicks sweat, promotes airflow through a mesh crown, and remains machine washable for repeated use. The white color keeps sun reflection high and pairs neatly with safety headgear or athletic helmets.

How quickly does the liner cool and how long does the effect last?

Activation is immediate: wet the liner, wring out excess water and snap it to trigger the cooling effect. The fabric drops to a significantly lower surface temperature within about 30 seconds and can maintain a cooler feel for up to two hours depending on activity and climate.

• Activates in three simple steps: wet, wring, snap.
• Noticeable cooling in under a minute for quick relief.
• Stays cool up to approximately two hours; re-wet to refresh.

Will it fit comfortably under my helmet or hard hat?

The liner is cut to a skull-cap profile that sits close to the head so it doesn’t bulk up inside helmets or interfere with fit. Lightweight, stretch fabric and a ventilated mesh crown allow the cap to conform to different helmet shapes while keeping sweat away from the eyes.

• Feather-light construction minimizes pressure under helmets.
• Stretch fabric accommodates various head sizes without slipping.
• Mesh crown enhances airflow for breathability under headgear.

Is the cooling fabric safe, durable, and easy to care for?

The technology is chemical-free and integrated permanently into the fabric, so cooling properties won’t wash out. The liner is machine washable and reusable, built to withstand regular laundering and daily wear while maintaining UPF 50 protection from sunlight.

• Permanently engineered cooling material — no topical chemicals.
• Machine washable for routine cleaning and repeated use.
• Built-in UPF 50 provides sun protection during outdoor use.

What activities and conditions is this liner best suited for?

The cap is designed for any situation where heat management and helmet compatibility matter. Use it under work hard hats, motorcycle or bicycle helmets, and team sports headgear, or wear it alone for running, hiking, and outdoor workouts when you want lightweight cooling and sun protection.

• Under helmets for motorcycling, biking, football, lacrosse, and construction hard hats.
• Standalone use for running, CrossFit, hiking, and outdoor training.
• Ideal for long shifts or extended outdoor sessions when staying cool matters.

Who is this for? The MISSION Cooling Helmet Liner suits active people who need fast, reliable cooling without added weight — athletes, commuters, outdoor workers, and anyone who wears helmets regularly. It’s especially useful for those who want a reusable, easy-care solution that provides sun protection and keeps sweat managed while maintaining full compatibility with their existing helmets and headgear.