Gildan is the second largest T-shirt brand in the world, alongside Fruit Of The Loom. The Gildan softstyle is probably the most popular T-shirt on the market for screen printers and people wanting to customise T-shirts for promotional purposes. The chances are if you have bought a T-shirt at a concert with print on it, it will have more than likely been a Gildan Softstyle. It has a tubular body so will not keep its shape as well as a garment with side seams but for the price it is a great option. 

The Softstyle is made from Ringspun cotton which means the surface is soft to the touch compared to your standard "scratchy" budget T-Shirt.