6 Hour Waterproof. When playing hard, reapply the block! Coppertone Kids SPF 40 Sunblock Lotion is uniquely formulated to provide long-lasting waterproof protection. This waterproof formula lasts for a full 6 hours in and out of the water, and keeps kids protected from the sun's burning UVA and UVB rays. 6-Hour Waterproof - Ideal for water loving kids. Long Lasting - goes on and stays on. Hypoallergenic - Non irritating and mild. PABA-free.