Has anyone heard of yacks, yaks, yax, etc. they are things you put on outside of shoes to keep from falling?

Question

they keep you from falling on ice and snow. they are made of black rubber and springs. a guy told me he got them off a tv ad a few years ago for $20. I saw them on a person who was testing them on pure ice on the parking lot. they did not slide at all. you just stretch them over any shoe or boot.

Answer 1

I Have.

Answer 2

Yes, I had , You are right... Such a shoe grip is there.