Our most cooling crew neck t-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 T-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.