These sandals are adorable and they feel wonderful, with one PAINFUL exception.  The thong, that is, the piece that goes between your toes, is made of cast plastic.

The thong is made by pouring liquid plastic into a mold.  The mold is made in two pieces so that when the plastic has hardened the mold can be pulled apart and the thong removed from the mold.  When plastic products are formed this way a ridge is formed in the plastic at the point where the two pieces of the mold met.  The manufacturer can file down that ridge and create a smooth surface.  Sensi does not file down the ridge.  They leave the sharp edges on the thong.

When I wore these sandals I very quickly got my skin rubbed off between my toes.  Very painful and now I have an open wound between my toes.  I can't wear the slippers because they are too damaging to my toes.  I am not inclined to be a whiner.  I am surprised more reviewers have not found this to be a problem.  The ridge really is sharp.