I was apprehensive ordering down a 1/2 size, so went up. My feet tend to swell and my classic crocs are a 9 and I feel those were always snug. So I ordered up to a 10 and am glad I did. I swear socks with mine at work and was amazed at how comfy my feet were all day long. And warm and toasty too. My socks were not sweaty like they get with the classics. I think it's because these a tad bigger and allow for better air flow around the foot? I don't know but I do know my feet were happy campers when I got home. Am ordering a pair in blue for my jeans now!