The GripGrab Summer Mesh Underhelmet Skull Cap is a soft and extremely lightweight bike helmet liner, designed to be worn underneath your bicycle helmet to wick away sweat like a sweat band and protect your head from harmful UV rays. This is a great piece of headwear for biking or running in the heat. Particularly with lightweight and well-ventilated helmets that feature many vents on top, the risk of sunburns is high. UV rays can hit your head through the ventilation openings and for riders with bold heads, this can cause sunburns on the skin. In contrast to conventional cycling caps, this bike skull cap is extra lightweight and thin, enabling you to wear it under your helmet with maximum comfort. It wicks away sweat quickly, which results in a cooling effect when the sweat evaporates. Further, it also prevents sweat from running into your eyes or onto your shades. This biking cap is also quite handy as insect protection, keeping small flies and mosquitos out of your hair. If you're not a fan of pirate-style bandanas, then the GripGrab Summer Mesh Skull Cap is a great solution for you. This cap is a unisex product for both men and women. Product Details: Material: Polyamide 65%, Polyester 25%, Elastane 10%. Colours: Available in Black and White. Size: Onesize (21 - 25 inch head circumference) - Please consult the size guide in the product images for further information. Included: 1 x GripGrab UPF50+ Summer Under-Helmet Cycling Skullcap