While these slides look and feel solidly constructed, they have a design flaw that will affect some individuals.  Specifically, the overlapping Velcro area is far too small - especially if you have wide feet and/or like to wear them with thick socks. Basically, I find them unusable when I want to wear them with socks and barely usable without socks.  The half of the locking surface that is still adhering slowly detaches, constantly making the characteristic Velcro tearing sound with each step.  If you have medium to narrow feet and don't wear these with socks, you shouldn't have any problems though.

Putting the strength of the Velcro flap aside, these slides have very nice padding and are otherwise extremely comfortable.  They appear to be rather durable, but I haven't worn them often due to the problems with the Velcro becoming undone.