These cross trainers are so dazzling I can't wait to put them on and then I can't bear to take them off! They are very supportive for someone like me who is doing rehab exercises for arthritic knee and hips. I can't afford to wrench myself by going over at the heel and the heel design and edges gives great stability. I take a 9 in dress/casual shoes but need the roominess for the sneakers so I got a 9and half. there is ample room for toe movement, maybe a tad too much, but okay. They are light, airy and kick-ass gorgeous!