Thermal comfort and performance for optimal winter training. Constructed from our most advanced material for winter performance - soft thermal on the inside, smooth on the outside with 4-way stretch and Polygiene® antibacterial technology. A WarpFlexx® calf panel provides a slim tapered fit on the legs. Storage options include two heat-pressed zip pockets, an envelope pocket on the back waistband for cards or keys, and a shirt loop.Model is 5’11 170lbs and usually wears size M. This product fits true to size so he is wearing size M for a slim, performance fit.