MISSION Cooling Helmet Liner — Digital Camo Gray, Low-Profile UPF 50 Cooling Liner for Helmets & Hardhats

This low-profile helmet liner uses HydroActive wet-to-cool technology to lower surface temperature quickly when activated with water or sweat. Made from breathable, odor-resistant fabric and finished in digital camo gray, it slips comfortably under bicycle helmets, climbing helmets, tactical headgear or construction hardhats so you can stay cooler without sacrificing fit or safety.

How does the liner actually cool when you’re working or riding?

The liner’s HydroActive fabric triggers an evaporative cooling response as soon as it’s wet, delivering a rapid temperature drop across the material. You can reactivate the effect multiple times by wetting, wringing, and waving the liner to renew airflow and evaporation.

• Activates with water or sweat; cools within one minute
• Fabric designed to reach up to 30° below average body temperature
• Effect can last up to two hours per activation and is easily reactivated

Will it fit under my helmet and still let my head breathe?

The liner is cut low-profile to fit neatly beneath helmets and hardhats while the mesh crown increases airflow at the top of the head. Its snug, universal design prevents bunching so helmets maintain their original fit and safety positioning.

• Low-profile shape designed for helmet clearance
• Mesh crown enhances ventilation and reduces heat buildup
• Universal unisex sizing for a secure, non-slip fit under gear

How do I care for the liner and will the cooling last through washes?

The MISSION liner is machine washable and engineered so the cooling technology remains effective after repeated laundering. It also resists odor buildup, helping it stay fresh across long shifts and frequent use.

• Machine washable; cooling technology will not wash out
• Fabric resists unwanted odors for prolonged freshness
• Lightweight construction dries quickly for repeated activation

What sun protection and performance features does it offer?

Beyond cooling, the liner blocks sun exposure with UPF 50 protection and keeps bulky headgear comfortable during extended outdoor work or recreation. Compact and packable, it stows easily in a pocket until you need it.

• UPF 50 for reliable sun protection on exposed skin
• Ultra-compact design fits in a pocket or tool bag
• Durable construction suited for job sites, trails, and field use

Who is this for? The MISSION Cooling Helmet Liner is built for commuters, cyclists, tradespeople, outdoors workers, and anyone who wears helmets in hot conditions and wants a simple, reusable way to manage heat. It’s a practical accessory for users who need sun protection, odor resistance, and an easy-to-activate cooling solution that won’t interfere with helmet fit or safety.