John H.wrote a review of Castelli Nanoflex Bib Shorts on December 5, 2012
I rode with these new bibs in 45 degree weather. I usually wear a large (170 lbs, 5' 10"), and these larges are pretty snug. The leg grippers are somewhat loose to allow for leg warmers to be worn underneath. I didn't experience any slip down of the leg warmers which has happened with other bibs. The fleece keeps you warmer than standard bibs and I was very comfortable in the temperature. I could see these being too warm in temperatures above 65.