The model or style number is a naming system for our shoes. While most of our "higher-numbered" styles feature more technology than our "lower-numbered" shoes, that is not always the case.
When deciding on a particular shoe, both the intended use of the shoe and your individual needs should be considered. The full model number, which is broken down into 3 parts, can be located on the underside of the tongue.
The letters before the number designate the gender and the activity for which the shoe was designed, as follows:
MT = Men's Trail
WT = Women's Trail
MO = Men's Outdoor/Multi-sport
WO = Women's Outdoor/Multi-sport
MW = Men's Walking
WW = Women's Walking
MX = Men's Cross-Training
WX = Women's Cross-Training
MC/MCH/MCY = Men's Tennis
WC/WCH/WCY = Women's Tennis
KJ = Kid's Running
KV = Kid's Running with hook and loop closure system
KT = Kid's Tennis
KX = Kid's Cross-Training
RC = Racing/Competitive
US = Made in the USA
The last two digits in a running shoe's style number specify the type of shoe as shown below:
40 (Optimal Control)*: Shoes in this category provide superior control, stability, cushioning and support for biomechanical needs, such as pronation or low arches (eg, 840, 1540).
*With the exception of the 840v4 running & 840v2 walking. These styles are neutral cushion styles.
50 (Fitness Running): For training on roads or for indoor workouts, the 50 series offers the combination of visual attitude and innovation with the responsiveness and power athletes need.
60 (Stability): Designs that offer industry-leading stability to reduce pronation while also providing unparalleled cushioning and comfort (eg, 860).
70 (Light Stability): The perfect combination of stability and speed, all in a lighter, sleek profile designed for runners who train at a faster pace (eg, 770).
80 (Neutral): For high-mileage runners who require light shoes and the protection of superior cushioning (eg, 980, 1080).
90 (Speed)*: For faster runners who want every advantage, including a superior ride and fit. The choice styles for professional and nonprofessional speed and distance runners (ie, 890).
*With the exception of the 990v4 and its predecessors.
The letters after the numbers generally indicate the major colors of the shoe. For example, WB indicates white and blue and BK indicates black. A number following after is the version number.