Crew Neck Hi Vis Sweat Shirts are made from a polyester outer layer and a poly-cotton blended back section that can help keep you warm during the chilly winter months. Crew Neck Hi Vis Sweat Shirts have a great two tone colour scheme that is available in orange/navy, yellow/navy and yellow/green with a full fluoro back colour. The sweater complies with hi vis regulations and can be worn during the night or day