LOVE running in my Xero Sandals! I wear them all year round (living in Indonesia) for running on roads, trails, biking, hiking mountains, walking, teaching P.E. and yoga/working out. I would wear them ALL day long (and sometimes do), but I think people would be too jealous, so I switch to regular flip flops. I have several versions of the Xero sandals and these are my FAVORITE - nothing between the toes, very cute yet sturdy and athletic, and no injuries to speak of. I run 10 to 20 miles a week, walk a LOT, teach P.E., and would swim in them if I could! ;o)  I had hip pain and a stress-fracture in my foot as a college All-American distance runner (CC, 5K and 10K) and marathoner 20 years ago using conventional running shoes, but not a single injury in the 4 years that I've been using my Xero sandals! I will KEEP recommending them and buying them myself. VERY worth the money and so wonderful!