Southern California winters, 40-60F, don't get too cold. But with this hat, the morning walk with dogs is much better and warmer! I love it the most for the edges as I can block out the bright sunlight without wearing sunglasses and it keeps my head and ears warm. I also get a lot of compliments from the ladies at the dog park. It felt a bit tight at first, my head is about 21 3/4 inches, but after a few weeks it loosened up a bit and is very comfortable now. I don't have a ponytail but the valve with the hole stays closed and I don't notice a cold without using it. I highly recommend it if you don't have a big head. I'm pretty short so that's good. I received cm/medium (I think) as women don't have a size or color choice. However, the men's hat without a tail came in two sizes, but only in black, and I didn't want black. If you have a big head, choose a men's hat or maybe a women's hat in two sizes and more colors, as is the case after the hustle and bustle of vacation.
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