M for men, but we have not find significant differences between the W & M besides for the overall size and width of the persons foot.
XC for Cross Country and initially designed with the middle distance athlete in mind.
This shoe provides the heel support that is often lost in more modern day rigid soles and whether you are on a grass track, trail track or synthetic surface, simply change out the spikes and you got yourself a great training shoe for the season.
Train with the heel support and softer sole. Get your sessions done with less foot and calf injuries. Higher rep volume and controlled intensity.
Compete with the rigid spike plate. Save yourself for race day when the reps are low and intensity is high.