Decided to try something other than Pearl Izumi. Very happy with the quality and fit. 5'11 and around 205lbs and XXL fit great. Thighs were a bit chilly at 31 degrees at ride start but nothing major. After warming up on the bike i was comfortable for the next 2 hours. I
I love Castelli bib shorts and tights. Very high quality and abrasion resistance during the occasional spill. I do 2-4 hour rides in the cooler months, so they're very comfortable for the long rides. These are great for the temperatures advertised, 39-59 degrees. I've used them down to low 30's for starting on mountain gravel rides where the wind chill isn't as severe. The fit runs just slightly small compared to other brands. I'm 6'2", 192 lbs. and wear an XL perfectly. I'm not much of a brand loyalist until it comes to my bibs. They're always Castelli's.
These are the best tights that I have ever owned.
I'm partial to everything Castelli, and I have less expensive tights, and more expensive tights. But these are hands down my favorites. If you know what size Castelli tightsshorts will fit you then you know exactly what size to order (I'd recommend one size larger than typical if you haven't owned Castelli previously).
I haven't worn them in temperatures lower than about 37 degrees, but I'm confident that they'll be comfortable down to the 20's. The fit is great, and I really - REALLY - like the zippers at the ankles. One complaint with Castelli tights, even the more expensive ones, is that I have to pull the the tights together at the zipper in order to get the zipper closed. Not so on these - it's super easy to close the zipper and the fit is still very snug and comfortable at my ankles and on the calves.
Id highly recommend these tights for anything from the daily commute to the long weekend ride.