Keen no longer makes the water shoe style I had and the new versions only have a strap in back. It was not so good in terms of value for money because the keyboards wristrest came damaged out of the box. Id ended up purchasing the Softwalk Bolinas instead. Firstly ordered a size 6 and they were too small, the size 7 was then ordered and again a VERY poor fit - not only snug (obviously they are new and will give) BUT they are amazingly short in length and not easy to hold grip as the slipper upper is too high. I advise all buyers to do the same. The noise floor on the Tecsun is perhaps a bit better, and weak signals very slightly more understandable. I find it easier to put them on when they are on the floor and I place my foot in them, then sure the wraps around my ankles. These are not the best in isolating sound, but it works well enough and keeps crying children noises at bay, more so that any open back. Additionally they are made in China (doesnt say which China though-Communist occupied, or Free Taiwan). Feel- These do not have the feel and the weight of the Sony controllers.