100% organic cotton. These racing t-shirts are made with a soft breathable fabric that is an excellent choice for the warmest day. It will mix great with any pair of jeans or pants you plan on wearing to the track or casually. We also offer custom racing apparel for any racing merch you might be intersted in selling such as dirt racing hoodies or more . Head over to our design/contact page today to make your own cool racing shirts! Simply send us a message with your design requirments and ideas and we'll get back to you with a mockup and pricing details . Racing shirts and hoodies available in cotton or Dri-fit .  Designing Services/Contact | Podium (podiumproductsusa.com)