An avid cyclist, I purchased the Modvel Knee Brace, black, 2-pack to wear pro-actively for support against knee stress. I measured a medium using the Modvel size chart. Have worn the braces several times now. Tight fit, but comfortable compression, and they haven't slipped even after a fast-paced 18-mile ride. I like the solid feel, fabric quality, and the rubber-like material at the top of the brace as an added feature to prevent slipping. And the black looks great, definitely cool! A good value at the Walmart sale price.