I'm 6'0", 225 lbs and I wear an XL - larger than typical US sizes but mostly fits my sizing based on the size chart but the legs are tight. It there isn't much elastic in the waistband, but it suits me. I really like the weight - warmer than athletic jogging pants, but not hot like fleece. And the material is also quite stretchy. Now for the minus - the seams. I bought these, to find pants I can wear in a layer on runs in 20-40F which is typical for Pennsylvania winters.Walk which is very annoying.I will still use them for the colder side of these runs with running pants underneath just a disappointment that i thought i found my one layer but i still need 2.