I'm 5'4" and 125 pounds and a runner. I have a bootay thatcan compete with any J.Lo on the planet and I'm not talking fat.My hips are 37 inches and the medium fit / but if I moved itdid not fit (ride up). The large fit better - but then theleg openings were too large.Bootay is not a bad thing to have these days!But these underpants certainly don't celebrate that.If you have any REAL junk in your trunk (muscle)then move on...I can see the wash-ability of these, but I'm not traveling.I'm living in them...and real life clothing goes in the washer.Just thought I'd try them. Light weight / but don't matchany of my shiny bras... in appearance...pass.