FIT & DESIGN: Athletic fit base layer Warms your core and manages ventilation and perspiration Flatlock seams prevent chafing in areas where the body experiences increased friction 3 dynamically complimenting fabrics work together to deliver ideal warmth where you need it most Stay-put elastic waistband offers a gusseted undercarriage for increased mobility run after run 4-way stretch material is integrated with spandex for optimal stretch and comfort Reflective accents on legs improves visibility at night and early in the morning TECHNOLOGY: Ergonomically placed Max Wick(TM) for increased breathability in areas where we run hot Polygiene(R) anti-microbial mesh in highest vent areas Exclusive Heatwave(TM) material means you get the warmth you need in just one base layer