I usually buy cheap $5-10 leggings for basic everyday wear, but I wanted to invest in better non-see through ones for my upcoming trip to the Grand Canyon and Zion. Im about 54 and 138 lbs and about 38 at the widest part of my hips. Medium is perfect! They fit and hug me just right. They keep your jiggly parts in place. Material is nice and slick. Not shiny but more of a sheen to them. Feels nice and stretchy. Great investment!