EVA sole with full toe lift and arch support, sole has recessed heel and non slip bottom with Cornell logo on strap.SIZING:Small – Ladies 6-7.5Medium – Ladies 8-10Large – Men’s 9-11XLarge – Men’s 11.5-13 SIZING:Small – Ladies 6-7.5Medium – Ladies 8-10Large – Men’s 9-11XLarge – Men’s 11.5-13