These flops are comfortable and gives my feet more breathing air. My feet size normally 7? but this one is big for me, so I returned it and ordered size 6. The heel is very attractive and safe - - not too narrow. They are stylish, very easy to install and the adhesive is strong. Ironically, the second order has held up. Have now discovered that a size 36 is equivalent to a UK size 3 1/2. I?d say I wouldn?t try these for any kids below 10 years old just to be on the safe side. They are very comfortable and just melt into your ear canal, helping keep your earphones in place and blocking out sounds in a very organic manner. The toe box has plenty of wiggle room, as much arch support as you can expect from a flat shoe and maybe a little more. In the end U-Shake gave me a 50% discount for a new set of water bottle cages, so they definitely got my return business!