I found this hat in a shop in West Yellowstone, wore it the next day to ski, and loved it so much that I bought two more - one in that same shop and one online. I have long hair and XC ski aggressively, so I get pretty warm. Having my hair outside the hat, rather than all in the hat and tucked down in a buff keeps my head from getting sweaty, and then I also don't get chilled afterward from having a sweaty head post-skiing. Plus there's no itchy hair on my neck while I'm skiing. The only thing that could be improved is a bit more ear coverage. I got the S/M size, and it fits my head perfectly but slides up a little bit while wearing, exposing a bit too much ear. The M/L was too big for my head, so that doesn't solve it. It's a minor issue though. The other thing that would be amazing is if this hat would be made in a slightly lighter weight for super hard/fast training days and races. I have been telling everyone about this hat, and the one other lady skiing with me in West Yellowstone went and bought one too. We're obsessed!