WSI provides you with soft, comfortable, dry-fit, American-made clothing that increases athletic performance and allows you to be your best. Product Features: Classic look and lightweight feel HEATR® in the collar provides added warmth to insulate the neck area Body-mapped for maximum warmth and wicking Thicker ProWikMax® material in the core and arms adds extra warmth, and thinner ProWikMax® under the arms allows ventilation Proudly Made in USA since 1990 Mock Neck