The Gi black is made 100% of pure cotton and of good quality. Cotton does not charge like art fabrics so strong and is especially skin-friendly.
Even for a beginner/ easy level's Bogu, it is made out of #7000 cotton and high quality leather. Through these materials, it makes an extremely good quality for its price.
Shitagi made of 100% cotton. This white Shitagi is worn under the normal Gi. It helps keeping you warm as well as absorbing perspiration.