Kimberly T.wrote a review of Castelli Viva Thermo Skully Cap on December 9, 2012
I will admit that when I first unboxed this hat and saw how rediculously thin it was I thought there's no way this thing is going to keep my head and ears warm. I was so wrong. I've worn this hat in temps between 25-50 degrees and my head and ears stayed toasty warm. Thanks to it's low profile it fits really well under a helmet. Worth every penny. Just get it!