I have to agree with another shopper that there is something about Fit Flops that has the other 'fitness' shoes beat. They are lightweight, comfortable and do not need 'breaking in'. The supportive arch support is awesome! For years I have battled hard callous formations that constantly grow on the bottom of my feet and in 6 weeks they have DISAPPEARED since wearing Fit Flops!!!!!!!!!!!! The bottom of my feet are smooth and no more irritating sore callouses! I wear an 8 in regular shoes, but a 7 in the sandals works well, especially the Pietra since my foot runs a bit narrow. I ordered this in an 8 however, since it is a boot and it is perfect! I can wear them with or without socks and it is a wonderful fit. I wanted a closed in shoe for cooler weather. I'm so glad I discovered Fit Flops!