O'Neill Men 24/7 Sun Tee Loose Fit Rashguard Swim Shirt Regular & Big/Tall Sizes Here's Something Cool: The 24-7 line is designed to function both in and out of the water, providing a comfortable layer between you and the elements. Not tight-fitting like typical lycra rashguards, this slim-fit (but not skin tight!) tee can be worn comfortably over a swimsuit or with boardshorts, or during active sports. Protects against sun fatigue and provides a breathable, cooling effect. Soft fabric feels great against your skin. Engineered fit with strategic seam placement for comfort lets you be active in comfort - or just lounge around! Tall sizes are 3.5 inches longer in the body. New for 2016: King and King-Tall sizes. King 1X is equivalent to 3X-Large, King 2X to 4X-Large, etc.