I hate riding on a trainer so need warm clothes when winter comes. I have only worn them once. It was in the low 40's and I was comfortable and was leaning toward the too warm side. I am very happy with them. I am 6' and 165 pounds and the XL fit me well. Castelli bibs run on the tight side and I normally wear a large. The XL is comfortable rather than tight. The bib straps are stretchy and very comfortable. Highly recommend these bibs for cold weather riding.