You make ask, why twice the size of other national brands? Well, experts recommend that you: * Apply 1 ounce of sunscreen 15 minutes before sun exposure * Re-apply immediately after towel drying, after extensive swimming, sweating and at least every 2 hours. Choose between our lotions, SPF 30, SPF 30 SPORT, SPF 50, SPF 50 Sport, SPF KIDS, SPF 85 and our SPORT Spray’s ranging from 3oz, 9oz, and 16oz.