ΘSunscreen and breathable: Made of professional functional fabrics, this skull caps helmets liner protects your head from harmful UV rays (UPF>50) and keeps you cool and comfortable in outdoor activities in summer. It is not stuffy and fits snugly under your helmets. ΘComfortable and safe: With a built-in liner that absorbs sweat effectively from the head, this skull caps helmets liner keeps your eyes free from sweat drips and enhances your riding comfort and safety ΘSmooth and sturdy: The skull caps s helmets liner is lathed with precision to create a smooth and sturdy material that fits the head well. It is durable and not prone to off-line or deformation issues ΘFoldable and light: This skull caps helmets liner can be stored in a minimal space because it is foldable. It is easy to carry with you because it is light in weight. It is a compact and useful item for your helmets ΘWide Applications: This skull caps liner can be worn under any helmets, giving you extra comfort and protection. It is suitable for various outdoor activities, such as cycling, running, mountaineering, rock climbing and fishing. This skull caps liner will keep your head cool and dry.