I've tried to make my own out of a push bike tyre I picked up from Halfords. I've made all my own studding to hold it all in place, and they work lovely, only problem is they are way too soft, been out for an hour and they are knackered.
Plus I find that I'm always wearing on one site, is this the same for other folks, or am I just strange. (Don't mean to steal the post)
Thanks
Davey