"Non-Slip Shoes So Ha" first appeared in Take the Plunge: Part 1, and Yellow Face advertised them in Insectophobe's Nightmare 2. It is a pink shoe. Despite being called a shoe, however, its design is almost no different to that of a normal flip-flop.
Based on what Flower said, it is used to prevent slipping.
Non-Slip Shoes So Ha first appeared in Take the Plunge: Part 1. They were revealed as a gadget to helping her staying in the balance beam by Flower, after Leafy and Pin failed to push Flower off the balance beam.
It later appeared in Insectophobe's Nightmare 2 as an item for Yellow Face's advertisement, claiming that they are in style these days. However, Purple Face interrupted the ad, saying that no one wear them anymore, as they are over two years ago. This caused Yellow Face to make a seemingly racist statement. Due to this, Purple Face calls for someone to reject Yellow Face, but he continue with the ad, making Purple Face interrupt him once more. Yellow Face got angry, and he ate Purple Face.