This Gi is made of triple weave strong Ripstop style cotton weave, durable super light; Jacket is made from one piece of fabric with no seam in the back for strength, comfort and durability. Collar is made of one piece of injected molded padded foam, that makes the jacket almost a full pound lighter and also helps to keep the collars soft and light, does not get soaked with sweat, also allows the gi dry faster and does not allow bacteria fungus to remain inside the collar. Reinforced chest, upper back, shoulders.