I bought several types of these speedos for my kids to use on our vacation and all 4 some varying in style had the exact same defect the stitching although no viable to the eye has extra stitching that causes friction on the arch of your feet. My 4 children all had 3 blisters each one on top of the other it hurt them so bad. Felt horrible had to purchase cheaper but more expensive do to being in the Bahamas in a souvenir shop and it saved our trip had to literally stock up on water proof bandages etc to help them. I needed up leaving all 4 to a local whom I hope makes good use of these horribly manufactured aqua shoes don't buyyyy. My children are all diffrent ages and sizes and again we purchased diffrent styles along with this one and all same thing.