So many reasons to love this shirt: 100% recycled fabric, UPF 40 sun protection, and a finish that repels water and stains. It's one you'll reach for again and again. Made from Bluesign approved recycled polyester that keeps you clean and dry all day. From our PFG line, this long sleeve knit includes thumbholes on extended sleeves, plus a vented back with mesh for enhanced breathability. Available in many sizes and colors. 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.