Inov-8 Men's Race Ultra 270 Trail Runner 100% Synthetic Imported Rubber sole For ultra running, trail running, long distance. A unique lug pattern with placement for ascending and descending uses the Tri-C outsole of hard, sticky, and endurance rubbers that takes into account the natural gait cycle and surfaces run on. Superior debris protection: the unique on-the-shoe gaiter hooks offer a more secure attachment system that allows you to attach our race ultra gaiter directly to the shoe and defend against debris. Race ready design: a stripped back upper design of welded protection coupled with the 4mm drop create the perfect balance of weight and protection for race day.