Why don't you make waterproof products?
No sunscreen formulas are water"proof" or sweat"proof" -only water and sweat resistant for up to 40 or 80 minutes. In order to claim this, the formula must be clinically tested. Reapplication is key!
Water/sweat resistant products: PLAY Everyday Lotion SPF 30 with Sunflower Extract, PLAY Everyday Lotion SPF 50 with Sunflower Extract, PLAY Antioxidant Body Mist SPF 30 with Vitamin C, PLAY Antioxidant Body Mist SPF 50 with Vitamin C, PLAY 100% Mineral Body Mist SPF 30 with Marigold Extract, PLAY 100% Mineral Body Mist SPF 50 with Green Tea Extract, PLAY Body Mousse SPF 50 with Blue Sea Kale, 100% Mineral Sunscreen Stick, PLAY Lip Shield SPF 30 with Shea Butter, Unseen Sunscreen SPF 40, Mattescreen SPF 40, Defense Refresh (Re)setting Mist SPF 40, Healthy Glow Sunless Tan, Glow Oil SPF 50, Sunnyscreen™ 100% Mineral Lotion, Sunnyscreen™ 100% Mineral Spray, and Sunnyscreen™ 100% Mineral Stick