The comfort and functionality make this Columbia Men's Twisted Creek II Short Sleeve Shirt a first choice for enjoying a day spent soaking up the sun. The high quality materials used to craft this men's shirt are what make it so special, while its modern classic fit and colors provide style and comfort. This short sleeve shirt features some of Columbia's best sun protection technology to help prevent skin damage while outdoors. The fabric is crafted of UPF 30 to protect against harmful UVA and UVB rays, sunburns, and long-term skin damage. The 100% polyester fabric is lightweight with quick-drying capabilities to keep you cool and dry during activity. Lastly, this short sleeve shirt features our signature logo at the chest for added style. Columbia's short sleeve shirt comes in many size categories and colors as well. 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.