How to use: Simply put on your 6.7L Cummins T - shirt and you're ready to show your style. It's suitable for daily wear, at car meets, or when you're working on your vehicle. Attention: Wash it inside out in cold water to keep the colors and prints vibrant. Avoid using bleach as it may damage the fabric and the logo. Maintenance: Hang it to dry to prevent shrinking. If you need to iron, use a low - heat setting and iron on the reverse side to protect the printed design.