I use Bear hair rests on 4 of 5 bows.I usually get a few years out of one.I'm not sure exactly when I installed these but for sure,the most recent was at least a year ago and the others should be 2-3 years.
The one that I think may be a year,almost looks new.The others have a little trough pressed down in the fibers but nothing cut or rubbed off.
I find that they wear much better for me than Velcro,seal or other things I've tried.My arrows are around 700 grs.
Now I'm talking Bear Hair rest that come from Bear.3Rivers sells another hair rest with shorter pile,that come in tan or black.These wear quicker though I like them for side plates and have used them on the shelf.The true Bear Hair rest is almost 1/4" thick and brown.
I've been shooting them since the early 1960's and just haven't seen any difference between then and now.Kentucky TJ may be on to something.I know I can't explain it.