From the website:
Cool Shirt Cool Water Shirts
Cool Shirt Cool Water shirts are designed to help you maintain a safe core body temperature while working or racing in hot environments.
They're not just a shirt—these unique garments feature built-in, non-kink tubing throughout to supply consistent, continual cooling to the wearer's torso. Cool Shirt Cool Water shirts help to reduce dehydration and prevent heat stress. Wearers can expect increased productivity and reaction time—with reduced errors! Designed for use with Cool Shirt Cooling Systems, these shirts are a smart investment for your health, safety, and comfort on the job or at the track. Order the size and color you prefer.
This is new, never used.