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If you’re shopping for new running shoes, more expensive doesn’t always equal more value. That’s good news for you and your checkbook, but don’t think you can go get a knockoff brand for $25 either. A team of Scottish scientists found no difference between $150 shoes and the relatively cheaper $80 versions. Not cheap, but comforting news nonetheless.

Lead researcher Rami Abboud, director of the Institute of Motion Analysis and Research at the University of Dundee, has some simple advice for you: Make sure the shoes fit!

“My advice to runners is to make sure that, first, the footwear fits your feet, and that if you are paying more, that doesn’t mean that you’re getting something better,” says Abboud.