Keep your head cool and protected with the ROCKBROS Cooling Helmet Liner Beanie Mesh — a lightweight, breathable cap designed to slip under any helmet for cyclists and runners on hot days. Its ice-silk fabric and mesh panels actively wick moisture and help disperse heat for long, comfortable rides.

• Material and cooling technology: Ice silk fabric with breathable mesh for fast cooling, moisture-wicking performance, and quick-drying comfort.
• Lightweight, ergonomic design: Ultra-lightweight (~20 g) and slim profile that fits under any helmet without bulk or restricted ventilation.
• UPF 50 sun protection: Blocks over 98% of UVA/UVB rays, helping prevent sunburn on exposed rides and workouts.
• One size fits most: Highly elastic fabric that fits head circumferences from 50 cm to 64 cm for men and women.
• Versatile use: Functions as a helmet liner or under hard hat; suitable for cycling, running, workouts, motorcycling, hiking, tennis, and more.
• Compact and portable: Thin, pocket-friendly design you can carry in a bag or pocket for on-the-go cooling.
• Care and color: Machine washable; color: Black; Brand: ROCKBROS.

With its rapid-drying fabric, sweat-absorbing properties, and sun protection, this liner helps you stay focused on the road or trail rather than sweat or heat. The ergonomic fit and lightweight construction reduce helmet chatter and irritation, making long sessions more comfortable. It’s a practical, portable solution for hot-weather training and everyday outdoor activities.