Ultra-high-molecular-weight polyethylene. Super tough and slicker than snot. Used on bottoms of drift boats, jet boats, etc. Same basic material used in total joint prosthetics. Cool stuff.
And snowmachine skis, slide rail 'hy-fax', etc. (5000 miles on the hy-fax easy, and over 20K on skis under some pretty rotten conditions; heavy, but generally worth it's weight.)
