Stay cool while you cast in this performance shirt, featuring UPF 50 sun protection and wicking power. This technology loaded tee is necessity for any day out on the water and under the sun. Made up of a combination of Columbia's signature protection fabrics: UV blocking tech works to shield you from harmful UVA and UVB sun rays, while the advanced wicking fabric works to pull perspiration and water away from the skin. Columbia offers this boating-ready shirt in multiple colors and sizes. Regular Fit. To ensure the size you choose is right, utilize our sizing chart and the following measurement instructions: For the sleeves, start at the center back of your neck and measure across the shoulder and down to the sleeve. If you come up with a partial number, round up to the next even number. For the chest, measure at the fullest part of the chest, under the armpits and over the shoulder blades, keeping the tape measure firm and level.