To use your Hanejiro T-shirt, simply put it on and show off your unique style. You can collect and trade the Ultra Dimension cards with your friends. When it comes to washing the T-shirt, follow the care label instructions usually found on the inside of the shirt. It's best to use a gentle cycle and mild detergent. For the cards, keep them in a dry and cool place to prevent damage. Also, since the sizing is Japanese and runs smaller, make sure to check the size chart before ordering to get the perfect fit.