Blue Whale 155g Hi Vis Long Sleeve Twill Shirts are perfect for the modern man. Made from pre-shrunk cotton, they are light and comfortable, with underarm air flow cotton mesh vents to keep you cool and twin pockets with button up flaps for a stylish finish. The pen pocket on the left hand side sleeve is a handy addition, and the shirt is classed as D, for Day Use Only. With a UPF Rating of 50+, it offers excellent protection from the sun.