Introducing our Matrix range of fitness products. We have combined our years of experience in the fitness industry to design and develop our Matrix range of fitness products.The ATE Matrix Knee Sleeve is a compression sleeve designed to help alleviate knee pain and reduce swelling. The Knit Knee Sleeve is a slide-on sleeve featuring a knit material that delivers breathability, flexibility, and comfort without limiting range of motion when on or off the field. Lightweight and low-profile, the Knit Knee Sleeve fits the right or left knee.