Adult Jiu Jitsu Belts by Century The adult sized Jiu-Jitsu belts come in sizes A1-A5 and are ideal for adults. Specifically designed for Jiu-Jitsu and feature nine rows of stitching. Made of high quality 100% cotton construction for supreme durability. Each adult belt is 5cm wide. Belts come complete with sewn on Jiu-Jitsu ranking sleeve.