I really liked the butt lifter, my jeans were sagging in the back and the butt lifter really helped them to fit better. I am  5'8" tall and about 145 lbs.  and I usually wear a size 8 clothes and medium..  I sized up because I did not want  to struggle putting tit on and taking it off and I am so glad I did because a size large fit very well.  I liked the butt lifter so much than I ordered two more.