I bought a pair of Sanuk sidewalk surfers two summers ago.  They ended up being the only shoes I wore. I also wear Sanuk sandals, including the new yoga mat style.  These shoes are extremely comfortable, extremely durable and machine washable.  I wear a 7.5 so I buy the size 7.  They feel a little snug the first day or two, but quickly stretch  to fit your feet.  I have noticed the fabric on this pair is a bit stiffer and has a bit less stretch than my previous pairs.  I recommend the looser weave fabrics if this is your first pair of Sanuks.  My only problem now is I'm spoiled to these shoes and don't like wearing regular shoes.