Screens out the sun's burning rays to help prevent sunburn. Provides protection from UVA rays that may contribute to skin damage and premature aging of the skin. Higher SPF gives more sunburn protection. Retains SPF after 80 minutes of activity in the water or sweating. Advanced sports equipment for active people. Specially formulated with DuraFlex, a durable technology that moves with your skin, so it won't get in the way of your game. Designed for extreme conditions that trigger sweating (heat, humidity, vigorous exercise) because it stays on strong and won't run into your eyes and sting.