This shoe was engineered for achieving your personal best. In collaboration with Tommy Rivs, Craft has created the perfect shoe for speed at distance. The CTM Ultra Race Rebel is extremely lightweight and responsive. With a Ud Foam Pro(TM) midsole and a minimal one-piece upper of engineered mesh and internal construction that allows superior comfort in an ultra-lightweight platform, you are free to exceed even your own expectations.a One-piece engineered mesh uppera Ud Foam Pro(TM) midsole - ultra light, ultra high rebounda EVA insole - ultra lighta Ultra-light, ultra-thin rubber outsole for fast road conditionsa This shoe is made with Craft's Race Fit. It is built for speed and as a result the fit is slightly more snug than our regular running fit - snug in this case means slightly more shallow at 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.FABRIC: 100% polyester Jacquard+TPU no-sew,Midsole: 100% EVA Foam, Outsole: 100% RubberFIT: AthleticAs a Swedish brand our products can fit long and lean. Sorry, but some say it is what makes us fast! So, if your normal fit is typically between sizes we suggest sizing up. Have any questions? Send us an email at [email protected] from Monday-Friday 9am - 5pm EST.