If it's really going to affect your performance, then invest in
a new pair of boots. After all, if you don't use your credits, then
it's all going to waste.
That's what I did after a year of using my chiong sua boots... the
heels were worn out and became highly slippery. I was also still
using the old leather boots then. So I took a deep breath and
bought the new Gore-Tex boots.
No regrets, man. 
