Sharks make me happy humans make my head hurts shirt is made of cotton. That’s why fabrics can be washed by hand or by machine without worrying about negatively impacting the quality and longevity of the fabric. If you are not sure about the durability of the fabric when washing the machine; You can use a dedicated laundry bag to keep the color durable and beautiful for your favorite outfit. In addition, this shirt is also printed with very special cartoons. So don’t hesitate to buy Sharks make me happy humans make my head hurts shirt. Wish you have a great experience here.