"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.
Yellow Face: Buy Non-Slip Shoes So Ha!
They're totally in style these days!
Like, Flower wore them this one time!
So, like, they must be GOOD!
Purple Face: So what?
That was almost two years ago!
Nobody wears Non-Slip Shoes So Ha anymore.
Yellow Face: OH MY GOSH!
You don't know anything!
Purple Face: RACIST!!!
Get this guy out of hiyah(here)!
Yellow Face: So yeah! BUY NOW!!
Purple Face: NO! DON'T!
Yellow Face: NNGGGG!!
(Yellow Face eats Purple Face)