Piranha Gear Blue Super Heavy Double Weave Uniform We designed these for people serious about grappling arts such as Judo and BJJ, but you could use them for Aikido, Jiu-Jitsu, MMA or any general grappling styles  though they are pretty heavy - so not so much for stand-up arts like Hapkido. Reinforced seams, with extra reinforcement in high stress areas like arm pits and cross stitching, double layer pants from knees to ankles and a very durable double weave fabric (700g jacket which means 25oz!) The pants use a "traditional" drawstring waist - no elastic.