I bought the Large size. I’m 5’8”, 205 lbs, with a stocky build and athletic legs, and this kit fits well. My first ride was a 30-mile stretch along Chicago’s lakefront in 30-35°F weather (wearing a long sleeve compression base layer). I felt slight coldness on my hamstrings only in sections where the wind chill dropped below 30°F. The zipper can be a bit tricky, but it’s decent quality. The long-sleeve thermal is comfortable and warm, and both the bib tights and thermal are breathable. As part of my weight loss journey, I wanted a kit that could adapt to my current size and work as I slim down. So far, this kit has checked all the boxes. I even had a clip-in mishap with my pedals and fell, but the bib tights barely scuffed. There were no cuts or tears in the material from the fall. Great value for the price.