XT-6Originally launched in 2013, the XT 6 is the preferred footwear for world class athletes running ultra distance races in harsh conditions. Trail runner Quicklace closure Abrasion resistant mesh and welded TPU film Padded collar Full length Agile Chassis System Dual density EVA cushioning in the midsole Materials Upper: synthetic and textile Lining: textile Outsole: rubber Size Guide Unisex style in US sizing. Listed in both Men's (M) and Women's (W)