All Sizes are in US Men's Originally launched in 2013, the XT-6 is the preferred footwear for world-class athletes running ultra-distance races in harsh conditions. It now returns with updated colors and materials. Responsive cushioning Dual-density EVA cushioning in the midsole protects your feet and ensures soft landings. Light & durable With TPU film welded on abrasion-resistant mesh, this shoe is lighter, less bulky and ready for any terrain. Enhanced stability The full-length Agile Chassis System (ACS) provides great stability over any distance.