Cooling insert using physical cooling technology provides extended head cooling, increasing comfort during long wear while ensuring safety and effectiveness. Breathable and comfortable: elastic components ensure compatibility with most helmets and hats, while continuous airflow delivers a consistently pleasant wearing experience. Durable, ergonomic fit: designed to align precisely with the head contour, the ergonomic layout supports fatigue-free long-term wear with minimal adjustment. Flexible use: significantly improved wearing comfort for cycling, camping, and fishing thanks to versatile applicability for a range of adventures. Key attributes Function: cooling insert with continuous airflow Compatibility: fits most helmets and hats Material/construction: elastic components Performance: extended cooling, precise head alignment, comfortable long-term wear Use scenarios Cycling: wear under a helmet for extended rides Camping: use for comfortable head cooling on camping trips Fishing: enjoy ongoing comfort during long fishing sessions