Coppertone's Sport Sunblock Stick is small enough to carry in your purse and works very well. My only problem is the same issue I find with many sunscreens - you have to be super careful to apply it evenly or you end up looking blotchy. Coppertone says that this stick is "Ultra sweatproof, Waterproof" and provides UVA/UVB protection. IMO, this sunblock really held up. I got splashed and was out in the hot sun on a fishing trip, and it protected my skin.