MISSION Cooling Helmet Liner — Lightweight Skull Cap, UPF 50, Instant Water-Activated Cooling for Helmets & Hardhats

MISSION Cooling Helmet Liner is a lightweight skull cap that activates with water to deliver instant cooling, fits comfortably under helmets and hardhats, and provides UPF 50 sun protection.

Designed for athletes, outdoor workers and anyone who spends long periods in heat, this helmet liner combines chemical-free cooling fabric with a ventilated, low-profile shape so it won’t interfere with helmet fit. The liner uses MISSION’s reusable cooling technology—wet, wring and snap—to lower surface temperature rapidly and stay cool through activity. Machine washable and durable, it’s intended for repeated use when you need a fast, portable way to reduce heat build-up beneath headgear.

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

When activated by water, the fabric begins cooling within seconds and reaches a substantial temperature drop below skin level in under a minute. With normal use it maintains noticeable cooling for up to two hours before needing reactivation.

• Activate: Wet, wring, and snap for instant effect.
• Rapid chill: Cools in under 30 seconds to well below typical body surface temperature.
• Duration: Effective cooling up to approximately two hours per activation.
• Reusable: Reactivate quickly by repeating the wet/wring/snap steps.

Will it fit comfortably under my helmet or hardhat?

The MISSION Cooling Helmet Liner is cut in a low-profile skull cap shape with feather-light fabric to preserve helmet clearance and comfort. Ventilated mesh at the crown encourages airflow so it doesn’t bulk up or create hot spots beneath a helmet.

• Low-profile design: Sits close to the head to avoid altering helmet fit.
• Ventilated crown: Mesh panels allow airflow and reduce sweat pooling.
• Secure fit: Contoured shape stays put during movement and activity.
• Thin fabric: Keeps weight minimal while providing cooling and sun protection.

Is the cooling permanent and safe to wash?

The cooling effect is built into the fabric and does not rely on external chemicals that wash out. The liner is machine washable and designed for long-term reuse without losing its cooling properties.

• Chemical-free technology: Cooling is fabric-based, not a topical additive.
• Washable: Safe to launder; follow garment care instructions to prolong life.
• Durability: Built for repeated activations and long-term use.
• UPF 50: Adds sun protection while cooling outdoors.

What activities are best suited for this helmet liner?

This liner is versatile for any heat-exposed activity—wear it under motorcycle, cycling, lacrosse, football or work helmets, or use it alone for running, hiking, CrossFit and outdoor labor. It’s intended to reduce heat discomfort and help you stay active longer in warm conditions.

• Helmeted sports: Football, lacrosse, cycling, motorcycling.
• Work use: Construction, landscaping, industrial sites under hardhats.
• Fitness and outdoor: Running, hiking, CrossFit, training sessions.
• Everyday use: Yard work, festivals, or any prolonged sun exposure.

Who is this for: The MISSION Cooling Helmet Liner is made for athletes, outdoor workers and recreational users who wear helmets or spend time in heat and want a compact, washable solution for immediate cooling and added sun protection. If you need to reduce head temperature without modifying your helmet fit and prefer a reusable, chemical-free option, this liner offers a practical, low-profile choice.