The Under Armour Armourvent Singlet has the following features: This Under Armour Shirt for men is a practical shirt suitable for sports like fitness and running and has a round neck. The shirt is made with the HeatGear Technology for keeping you cool, dry and comfortable. The short is made of polyester with rayon and has a loose fit.Specifications: Under Armour sportshirt for men HeatGear technology Sleeveless Fabric: 100% polyester Tags: Under Armour, shorts, sportshorts, fitnessshorts, fitness shorts, runningshorts.