The jacket is made of 350 gsm (grams per square meter) pearl weave. Rubberized collar to prevent sweat and bacteria from being absorbed into the collar. The pants are made of 8 oz cotton and are extra reinforced around the knees. Elastic waist and drawstring. According to Manto, the gi will shrink approximately 2-7% 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.