Anibal D Hi , Brian, you can see the size on mammut page, http://www.mammut.ch/en/productDetail/211000970_v_0481/Ophir+3+Slide.html is in centimeters ... On other sites I see that the measures are: Small fit waist 25 - 30 in., leg 18.5 - 22 in. Medium fits waist 28 - 33 in., leg 20.5 - 24 in. Large fits waist 30.5 - 36 in., leg 22.5 - 26 in. X Large fits waist 33.5 - 39.5 in., leg 24 - 28 in. XX Large fits waist 36 - 42 in., leg 26 - 31 in. I bought a Small size of this harness and I can tell you that is too smaller, like for a woman or a boy ...

TIM L Smaller than a waist of 31''-32'' would be a small in this particular harness. I am a 31'' so I purchased the medium.