Black knee sleeves made by zawick to reduce joint stress. - Brand: zawick - Product Name: Knee Sleeves - Size: Calf size: 38-40cm, 5mm thick, Size M - Color: Black zawick knee sleeves, knee support, muscle training, squats, weight training, reduces joint stress I used it once, but the size didn't fit, so I stored it. I use the S size of this product, and it has good support, making it perfect for leg training.