Fishpond Sun Screen is a natural based product of the company fishpond that: -Is fly-line safe -Is Water Resistant (up to 40 minutes) -Protects you from Blood Spectrum UVA-UVBS -Has Micro-Zinc Oxide which prevents natural broad-spectrum protection against UVA and UVB radiation. For best results, dab it around, and rub it into your skin. Meant to apply every 2 hours and after swimming or towel drying.