Purchased the Men's Vertex Thermal Bib Tight Black / XL for winter fat bike riding. I am 5' 11" and currently 185 lbs. The XL fit pretty good, had considered exchanging for XXL for waist tightness but kept them - they fit fine, they do not fall down at all as mentioned in some other reviews. Two rides so far: 1) 20 deg F w/ maybe 15 mph wind. I was pretty comfortable during the 2 hr ride though a bit warmer when the wind was at my back. 2) Started at about 20 deg F and warmed up to about 40 deg F after 2 hrs., overall I kept warm and then very warm. They are working well for my winter rides and would consider purchasing again and looking at other Pactimo items