kevin.gt2248759wrote a review of Castelli Sanremo 2 Thermosuit - Men's on March 8, 2017
Familiarity: I've put it through the wringer
This is the most comfortable winter kit I've ever worn, although it's not the warmest. I find that I'm comfortable in this kit from ~40°F up to ~50°F. Castelli rates the kit from 41-59°F, but I find I get too warm above ~50°F. In the 30s I need a base layer. Below that I'll add a jacket, a balaclava, and some ski socks. As with most of Castelli's more race-cut stuff, the sizing seems a tad small. At 6' 0, 185 lbs, the XL fits me perfectly.