I like this yarn. It's pretty soft for being acrylic and it's easy to work with. Plus it's always on sale at Michael's.this pattern as a guide.
I say "as a guide" because I couldn't get the size right, for my foot anyway. The red ones are a bit too big, so I went down a few crochet hook sizes and made the blue ones, which are a bit too small. I'm like Goldilocks over here!
I added a little flower detail and left the strap off.