Sports Knee Pads used by High Quality Soft & Elastic Polyester Fabric,Nice workmanship.Made from high-density lycra fabric, high elastic material and comfortable to wear, can effiectively prvent knee down in the movement , relieve stress in motion and it is useful to coordinate muscle capacity and to protect the skin. Each filler is a single particle that is ergonomically arranged to prevent impact. This support design is highly flexible, helping to protect your knees from injury and friction while not limiting your freedom of movement and your overall fluidity. Fit tensile strength for basketball, baseball, football, outdoor & indoor etc.