Castelli has created a bib short that could be worn under a lighter pair of tights in Spring or Fall or potentially a very cool Summer morning. They are exceptionally comfortable and I have worn them on fifty mile rides with little complaint form my backside. My pair of size medium fit my 5 foot 9 inch frame nicely. I usually weigh between 160-165 pounds. If you are tolerant of "lower" temperatures these would be excellent for 50-60 degree rides all by themselves. With all my new Castelli gear I have stopped putting them in the dryer after washing even on the super delicate setting. Read the directions for yourself and given the amount of money involved I say err on the side of caution. I wish I could put them in the dryer but I'll trade off the time between uses to have them last longer. I like them that much.
Nothing like trying to spray sunscreen on per ride right? Gets all over and is sticky as well as washing off less than an hour after you ride on a hot day. These fit well, wick away sweat and protect you all ride long. I own two pairs and I bought a pair for my wife who does long hikes. I was confused about size which kept me from buying these sooner, Castelli (on their website) actually sizes these by body weight. I run between 160-165 pounds and large fits great. My wife at 115 pounds is a small. I am honestly thinking of buying the leg screens though I don't mind sunscreen on my legs. If you are fair skinned these could save you from a bad burn or worse. Last point the grippers hold tight and and the sleeves should be put on BEFORE you put on a watch or ROAD ID otherwise they are annoying to put on.
If it wasn't comfortable I wouldn't wear it. Keeps me warm on 50 degree days. Knock's the wind down as advertised. Quality zipper, good rear pocket storage. I would definitely buy this item again.