The fabric is made of 100% polyester. You can wash your TripleB t-shirt regularly in the washing machine at 40°C, but we would advise you to not put it in the dryer. Your Beer, Barbells & Baseball DryFit t-shirts are great for your training sessions. This TripleB DryFit t-shirt accentuates the chest, is well fitted and simply awesome. The fabric is very comfortable and easy to wear on the skin, even during sweaty workouts.