Because I live in Japan and have a size 13 foot, I have trouble getting footwear and clothes to fit. Amazon is a lifesaver for me, and I have confidence in recommending them.
First off, the Crocs were delivered before the scheduled date. That rates 5 Stars right there. I bought these 'higher sided' Crocs because Japan gets WET in he rainy season. Many puddles! My regular Crocs seem to breath in water from the air holes on the sides. I'm NOT criticizing  Crocs, I wear them every day and I like the 'H' out of them.  But they DO let in the rain. These NEW Crocs have the problem licked. Higher on the heel and no side vent holes. The inside liner is a little warm for Japan in the summer, but I'm looking forward to trying them out next winter. I wondered about no heel strap, but so far no problems  with them at all, and they arrived on the day 'tsuyu' the rainy season started, so I used them right out of the box. They're kind of classy (dressy) looking and I'm very happy with them.  Anyway, since it' my policy NOT to give perfect scores for anybody (even me) I'd have to give these Crocs only 4.5 Stars.