The jacket is made of 450 gsm (gram per square meter) pearl weave. Rubberized collar to prevent sweat and bacteria absorbing into the fabric. The pants are made of 10 oz twill cotton. Reinforced stitching on all stress points as well as reinforced knee areas. Belt is sold separately. – Jacket 450 gsm pearl weave. – Pants 10 oz twill cotton. – Reinforced on all stress points. – Rubberized collar. According to Manto, the gi will shrink approximately 3-5% after washing in 30 degrees. 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.