There was a guy at the Y last night running with one of those on. He was in full sweats and a knit hat and running 7:30 miles. I was in a singlet and shorts and I thought it was hot as heck.
My kids all play soccer, and last fall most of the boys would wear their knit hats on the field, along with the long hair now that is so stylish with male soccer players...I was hot just watching them.