Strict. Wedding bands because I assume most are sized right and will not fall off even in water, and most married people like having their bands on more than any other jewelry. No earrings, no bracelets, no anklets or toe rings, no necklaces, no hair bands or other things that could fall off in water. My DD had woven string bracelets on her wrist and they let her keep them on (they were knotted so they would only come off if broke or cut), but DC said just be careful as they had those type of bracelets come off in the water and get lost. Hers did not. They were fine.