El velcro de detrás no me ha dado ningún tirón de cabello ni nada parecido, funciona muy bien y lo puedes apretar cuanto desees. I also find the maximum volume I can get from the Runner 60s is significantly lower than my AE-30s. Since I have smallish feet, I have found that I can wear the Chaco childrens sandals for casual wear (they less arch support and a softer sole than the adult versions - so not suitable for long walks, hikes or wearing on uneven pavement/cobblestones). Others have said they are too narrow, but I disagree if you have a medium width foot. These shoes exceeded expectations. Now for what could be better. I never used it with the straps. Colour combo allows these sandals to be worn with a variety of styles and outfits. (In the pic I bent one to show you. Then you have to spend another 30$ to download 3rd party software that actually works.