MISSION Cooling Helmet Liner - Lightweight Breathable Skull Cap, Lapis Blue, Cools up to 2 Hours & UPF 50

MISSION Cooling Helmet Liner is a lightweight, breathable skull cap that activates with water to lower surface temperature, fits under helmets, and provides UPF 50 sun protection for up to two hours of cooling.

This liner is built for people who work, ride, or play outdoors but still need a slim, packable cooling solution that fits beneath hard or soft helmets. Constructed from breathable HydroActive fabric with a mesh crown and engineered to resist odor, the liner cools quickly when wet, stays compact for easy storage, and is machine washable so it’s ready for regular use.

How quickly does the liner cool and how long does it stay cool?

When activated with water and wrung out, the HydroActive Wet-to-Cool material lowers surface temperature rapidly—within a minute—so you feel a noticeable cooling effect. Performance depends on environmental conditions, but the fabric is designed to retain that cooling sensation for up to two hours before reactivation is helpful.

• Wet, wring, and wave for immediate cooling
• Works in a variety of temperatures and activity levels
• Reactivatable multiple times without losing performance

Will it fit under my helmet and stay comfortable during long shifts?

The low-profile, unisex design tucks under most bicycle, construction, and sports helmets without adding bulk. A mesh crown improves airflow, while the lightweight fabric reduces trapped heat so you can wear it for extended periods with less discomfort.

• Ultra-compact—pockets easily for on-the-go use
• Thin profile compatible with bulky or slim helmets
• Mesh crown increases breathability and ventilation

Does the liner protect from the sun and how do I care for it?

The material offers UPF 50 protection to shield skin from ultraviolet exposure when used as a helmet liner or standalone cap. It’s machine washable and built to resist odors; the proprietary cooling treatment is integrated into the fabric and won’t wash out.

• UPF 50 reduces UV transmission through the fabric
• Machine washable for regular maintenance
• Odor-resistant finish for lasting freshness during repeated wear

How do I activate and reactivate the cooling effect?

Activation is simple: soak the liner briefly, wring out excess water, then wave or snap it in the air. The process restores the cooling effect quickly and can be repeated as needed during a job, ride, or activity without special equipment.

• Soak in cool water for a few seconds
• Wring out until damp, not dripping
• Snap or wave to accelerate evaporative cooling

Who is this for: The MISSION Cooling Helmet Liner is ideal for outdoor workers, cyclists, construction crews, and athletes who need a compact, breathable cooling solution that fits under helmets. It also suits anyone wanting UPF 50 sun protection, reusable cooling on demand, and easy machine-wash care for frequent use.