Pedi-Sox are, well, pedicure socks. :) They are open at the toe to let your toes out to be painted. They come in several versions ranging from thick, warm socks to thinner socks for warmer temperatures.
Ravelry: Pedicure Socks free pattern by Deneen St Amour
Ravelry: Sassy Pedicure Socks pattern by Lisa Gentry
Wish | Pedicure Exfoliating Foot Mask Beauty Exfoliation Feet For Pedicure Socks Peeling Foot Care (Color: Milk white)