They are slightly big - but not falling off by any means - I ordered a 7, but am usually 6.5 - the reviews said to order larger and I did - I think they will be fine - the 6.5 may have been too tight.  I wore them shopping last weekend and they are extremely comfortable, for new flip flops - no wear-in time - great right off the bat and they seem to stay on your feel really well - so far very happy!