The official Chaco recommendation is to size up if you're a half size -- i.e. if you wear a 6.5, get a 7. My "street shoe" size is 6, and I wear 6.5 in running shoes, and I ordered size 6. My toes don't have a ton of space in front of them but they're also not hanging over, and it feels like the correct fit overall for me. My heel is nicely cradled where it's supposed to be, arch is where it's supposed to be, toe straps hit in the right spot, etc. It's a comfortable fit for me, and I think if I had sized up to 7, I would've felt like I was dragging around clown shoes. I hope that helps!