Our most cooling crew neck tee shirt, the Ultracool poly/cotton, is made from a highly breathable poly/cotton blend and fashioned to provide a loose, weightless overlay that is highly wearable and ideally suited for long outdoor days in the heat. The safety tee shirt cools the wearer while providing both good visibility and maximum comfort. It’s the right choice for any late afternoon or spring/summer work when the temperatures start to soar.