This hat definitely does a great job in keeping my head including ears in the cooling weather.
I think I've worn this cap nearly every day since I got it. It's super soft, plenty toasty, but also quite breathable. Plus, I love the no-static inner liner because no one likes crazy, static-y, hat head when you take your cap off. This is great under the helmet on rides but I've also worn it trail running and chilling at the camp site. Only odd thing is it's listed as One-Size but when I got it, it had a S/M tag on it? I might have opted for a L/XL if available because I've got an ample-sized melon.
First ride with the hat was a metric century in 40-50 degree temps. The hat was absolutely perfect for those conditions