The jacket is made of 400 gsm (gram per square meter) pearl weave with reinforced stitching on all stress points. The pants are made of 10 oz cotton material with double reinforced knee areas. The gi’s collar is made of synthetic heat resistant vulcanized rubber to prevent sweat and bacteria absorbing into the collar. This gi is designed to comply with the IBJJF 2024 rule set. Belt is not included. Jacket: 400 gsm pearl weave. Pants: 10 oz cotton. 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.