Despite what others say about too small, do not think it pertains to all when sizing speedos.I am a comfortable 34 waist and ordered a 34 in this and glad I did. It is perfect.Many might not understand they have to fit tight in order to not just slip off. But if you do have more of a butt, then I can see you needing a size up.I have a booty but not a crazy outwardly pushing bubble butt.I do however think Speedo should make the backs or waist area about 1" to 1.5" taller for workouts to ensure no butt crack shows. I think depending on your body type 1" should be fine for most. They are great for doing squats and workouts and swimming of course. I highlight recommend these and Speedo, if you make these where the waist material is another 1" taller then I would like to be your tester. I love my Speedos!