I received the Riptide Mules last week and wore them immediately.  They are the most comfortable shoes I've worn in, jeez, I don't know how long.  The toe box doesn't squeeze my toes when I walk and the heel doesn't rub.  There's no rubbing anywhere.  I've been looking for shoes I can wear walking around town, traveling or to the mall. The styling is attractive and looks better in person than on-line.  But, it's the comfort that sells it for me.

I normally wear a size 8 and, in this shoe, it's a roomy size 8.  It is slightly large on me and I'll have room for thin cotton socks, too.  I don't know if a 7 1/2 would fit since the length seems correct.  But, someone with a narrow foot might find the shoe is too wide.

I'll have trouble wearing any other shoes for casual wear.  Since I think they're wonderful, I'll be ordering another to give this pair a break.

Editing:
The shoe is undoubtedly comfortable, but I'll have to get a smaller size.  The slightly roomy feel has given way to way too loose and recently I've hardly worn them since my toes are trying to hold them on my feet.  The lack of support also makes them good for only a few hours.  They are no longer my slip them on and run out shoe.  They're OK, so if I discover the 7 1/2 fits well, I may change my star rating.