Crafted to specifically meet the needs of trail, and ultra-distance running for elite athletes. The CTM Ultra Carbon Trail shoe combines specially formulated Ud Foam with a tuned carbon plate for the ultimate in efficiency and energy return. It also features a Vibram Megarip traction outsole that will define a new standard in speed and versatility over the harshest of terrains. The nylon upper is highly durable while remaining lightweight and flexible, and the no-sew overlay provide critical protection without sacrificing speed and feel. This shoe is the complete package for attacking the elements. - Lighweight breathable nylon mesh upper with no-sew TPU support elements - Vault Foam midsole - ultra light , ultra high rebound - Ultra rebound insole for maximum energy return against the foot - Vibram traction outsole with Megagrip - Tuned carbon fiber plate with precision split for torsion and variable energy return - Weight: M 340g / W275g - Stack height heel: M 40mm / W38; Stack Height Forefoot: M 30mm / W 28 - Drop: 10 mm This shoe is made with Craft's Race Fit. It is built for speed and as a result the fit is slight more snug than our regular running fit - snug in this case means slightly more shallow and the toe and slightly shorter in length. These attributes of tight fit are engineered purposefully in order to achieve greater velocity. For those of you that are in between sizes, or that prefer more room, we recommend sizing up. Material: 100% polyester Jacquard+TPU no-sew,Midsole: 100% EVA Foam,Midsole insert:100% carbon, Outsole: 100% Rubber Scroll to learn more! Want to try on a pair? Find a footwear retailer.