New Balance Men's Apparel Size Chart When temperatures rise, take your workout gear up a notch with the NB ICE LS performance top. This season's version is updated with more mesh on the back for extra breathable comfort. During rigorous workout sessions, the structured knit design with strategic mesh piecing and sweat-activated NB ICE cooling technology keeps air flowing freely, while a headphone port at the back collar helps keep cords in place. Plus, an underarm gusset allows for greater freedom of movement, while 360deg reflectivity helps up your visibility when training days extend into evenings. Features: - 360 degree reflectivity for safety and visibility - Athletic fit - Back mesh insets - Underarm gussets - Media loop on back collar - 93% Polyester and 7% Spandex