This performance skull cap features our patented Sweat Seal; this seal RE-DIRECTS and CHANNELS sweat away from your eyes, face, and glasses No more burning, stinging eyes from sweat or sunscreen! GRIP Technology holds the cap in place during any activity The micro-mesh top breathes extremely well and keeps your head cool 4-way stretch mesh fabric conforms to your head for a comfortable smooth fit The top provides UV sun protection with UPF ratings of 35 to 50. Black, Camo Grey, Camo Green and Star Gazer offer UPF rating of 50, White has UPF rating of 35