The jacket is made of 300 gsm (gram per square meter) cotton blend. Rubberized collar to prevent sweat and bacteria from absorbing into the fabric, the collar is also reinforced with extra seams. The pants are made of 8 oz twill (cotton/polyester blend) and is reinforced at stress points. Belt is bought separately. Jacket: 300 gsm cotton blend. Pants: 8 oz twill (cotton/polyester blend). Limited edition. Please read size guide and washing instructions below. If you have any questions, please contact customer service . Also read the Rebelz Ultimate BJJ Gi Guide for advice and tips.