ICEBUG running shoes are available with 3 unique traction technologies. RB9X® - Rubber 9 Extreme is our latest development in rubber compounds and sets a new standard for friction. Laboratory tests (SATRA) show that RB9X® outperforms the competition, yet still matches the durability of an asphalt running shoe. In the real world, this means much more reliable traction in wet and slippery conditions and on difficult surfaces like rocks. OLX® - Fixed studs, when slipping isn't an option. We set the standard for crampon shoes, and OLX® is now continuing it for trail running, OCR, and orienteering. Made from carbide steel, which is 6-7 times harder than regular steel, these studs are virtually wear-free. BUGrip®   is the name of ICEBUG's grip technology for the most slippery conditions. The BUGrip sole is made of a special rubber compound and 15-19 integrated steel studs.