DescriptionStay fresh on the water or when youre rooting for your team with this versatile button-down built with UPF 40 sun protection sweat-wicking tech antimicrobial properties and a rod holder at the left chest. It’s lightweight yet durable with our signature technologies to keep you comfortable—Omni-Shade UV-blocking protection and Omni-Wick performance wicking. Plus an antimicrobial treatment fights odor between washes while cooling vents keep you cool and comfortable. Columbia offers this short sleeve in multiple colors and sizes. Available in extended sizing. Relaxed Fit. To ensure the size you choose is right utilize our sizing chart and the following measurement instructions: To determine the neck size measure at the base or thickest part of your neck. 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.