Thank you for viewing. This knee support uses patented technology to promote blood circulation and support walking. It's a free-size support item equipped with technology to support joints and make walking comfortable. One box contains two pieces, for both legs. :Brand: RKL :Product Name: SMOOTH MOVE SUPPORT :Type: Knee Support :Technology: Patented Technology : Size: Free Size (for calf circumference 30cm-40cm) :Features: Technology to support joints and walking :Design: Black stocking type The product has been opened for inspection, and the box is torn. Thank you.