Thinkbaby and Thinksport sunscreen is highly effective, falls into the highest category for water resistance and has a sensible SPF 50+ rating. A quick look on your local drugstore shelf will show an increasing number of chemical sunscreens boasting ultra-high SPFs of 70 and greater. An SPF higher than SPF 30 offers only minimal improvement in sun protection and does not provide insight into its ability to protect for both UVA and UVB. Instead, these ultra-high SPFs are inflated through the use of chemical UV absorbers. The FDA has recently ruled that SPF numbers above 50 are not allowed. They have also ruled the terms "Sweatproof" and "Waterproof" as false claims.