For those of you who have been slogging it out at the gym but can’t seem to get that Kim K butt, it may be time to give your behind a boost with booty lifter leggings. These leggings look like normal yoga pants but feature a special fabric that claims to “mistakably lift your butt, slim your waistline, and hide the appearance of cellulite.” They also claim to feel just like your second skin. And, of course, they’re super cute.

But, are these leggings actually doing what they say? After all, if you’re going to spend a fortune on them, you want to be sure they work. Textile expert and assistant professor of textile development and marketing at the Fashion Institute of Technology Preeti Arya isn’t so sure. She says the fabric is likely just a regular type of west knitting that has been modified with ruching, a type of pattern stitching, to create a textured appearance.

Luckily, there are plenty of other options that will sculpt and lift your backside just as well. Check out some of our favorite pair below:

Enhance Your Curves: The Magic of Butt Lift Tights for a Shapelier You

These high-waisted 7/8 Airbrush leggings are made with a fabric that’s designed to sculpt, lift, and make your butt look spectacular—while being comfortable enough to wear throughout a workout. The material has sweat-wicking properties, four-way stretch, and a soft waistband to keep you cool. Plus, they’re available in a bunch of fun colors.