"I bought the Xtra Small since I'm 5'7" (170cm) and they fit perfect. I have a 29" (73cm) waist circumference and I use 30" in-seam pant length. These are a nice durable, thicker material. Not very breathable, but that's ok for me as I was not looking for that. The logo is a nice touch. The waist cord is a bit long, but not a huge problem. Overall highly recommend them."

"Absolutely love these pants- I now have both the black and the grey ones- black for the gym and grey for lounging around at home, and they are perfect for both. My only comment, which isn't a complaint by any means- the crotch is really low, so if you wear your pants at your waist, you are good with PLENTY of room to move around,. but if you are used to wearing your pants lower, they'll look REALLY low.. Likewise, if you are looking for something more form-fitting, these are more "roomie" in the crotch and upper leg.. so just be aware. For reference, I'm 5'5" with a 28" waist and I wear size XS. Love sporting the THENX logo now when I do my pullups and dips :)"