Radians ST11 Class 2 Hi-Viz T-Shirt with Max-Dri Moisture Wicking Mesh is made with an arid Birdseye Mesh allowing for maximum breath-ability, without compromising durability. The stripes are adhered by heat transfer rather than sewn on, making the safety T-shirt wear much more like a regular T-shirt. The wicking properties improve hot weather comfort making it feel much cooler.