Columbia's casual wear is loved by everyone for its superior comfort, functionality, and subtle style. The Columbia Men's Utilizer II Solid Short Sleeve Shirt is a must-have staple for hot weather weekdays and weekends. The high quality materials used to craft this men's shirt are what make it so popular, while its modern classic fit and in-trend colors provide style and comfort. This summer loving shirt features some of Columbia's best sun protection tech to help prevent skin damage from the sun. Its UPF 40 fabric protects against harmful UVA and UVB rays. Antimicrobial treatment and venting protects it from body odor, while ripstop polyester fabric is designed to wick perspiration away and dry quickly, keeping you cool, relaxed and dry. This Columbia short sleeve comes in many sizes and colors. Available in extended sizing. 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 elbow. 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.