The Pearl Izumi Transfer Lite Skull Cap is made from lightweight UPF 50+ Transfer fabric for optimal breathability and sweat absorption. Minimal silicone grippers give it that barely there feeling that is critical for a comfortable under-your-helmet fit. Unisex, one size fits most. FEATURES: P.R.O. Transfer fabric provides optimal moisture transfer, dry time, and odor absorption. Provides UPF 50+ sun protection Lightweight elastic band for secure fit Anatomic paneling for a performance fit