Was specifically looking for a low-profile skully, to wear in our usually-mild deep South cooler wx / winters. There are a LOT of similar choices out there, with seemingly wildly varying prices, most with a fair amount of negative reviews, for some reason: too small, doesn't cover ears, ill-fitting, etc.. My ears are quite sensitive to cold, so that is a deal-breaker for me. Fortunately, this Castelli Pro Thermal Skully turned out to be ideal: snug-enough fit to stay in place, but not tight. Material is thin enough to not affect helmet fit, but is warm enough, and seems to be windproof, and covers my ears (precise fit is adjustable enough that it would seem to be able to fit nearly any size head). Fabric seems to be pretty breathable, too, and should do well in cold wash + air-dry. VERY happy with it!
Got these covers to replace my well-worn Castelli Toe-Thingy covers which were not enough for the weather here in Maine. These are a big improvement in comfort... cold still gets in but a lot less and is now tolerable on 2 to 4 hour rides. These are very tight and probably need to be - I got the size "L" and they just fit with a lot of effort on my size 44 Fizik road shoes. Once they are fitted, it is clear that "L" is the right size, but it is a bit of a struggle at first. Overall, very happy with these covers. The eye-sore yellow color is a big addition to my being visible to distracted drivers too.
Over the years I have used Pearl Izumi pro thermal arm warmers. Those are great but I always wanted something that was a touch less warm and more breathable. I found the perfect pair of arm warmers in the Castelli Pro seamless 2. They provide just enough warmth for nippy fall days, but are much more breathable than my pearl izumi ones for hard intervals. Also, I thought that it couldn't get more comfortable than the pearl izumi ones, but these are even more comfortable, and they are very well constructed with a very engineered fit. Highly recommended.
Two teenage boys in my life ride their bikes to school every day. As the weather got colder their helmets weren't sufficient to keep their ears warm and their hats didn't fit under the helmets. When I spied them riding with their hats and no helmets I did some research and found your product. The headbands worked and now the boys are compliant with their helmets. It also came after a brief lecture on the dangers of riding the city streets without head protection. Great product!