Incredibly slippery on hardwood floors or other smooth surfaces.  I slipped and fell on my front porch steps while wearing these flip-flops.  Very comfortable on rough pavement or on the ground, where there is no danger of slipping, but assuming you live in a house and not in the woods, avoid these.  I assume they would be just as treacherous underfoot on wet pavement, so I cannot think of a good reason to buy them.