Body Glove 90190 Breathable Neoprene 10-Inch Knee Support, Black, Medium Breathable, Open-Cell Neoprene For Comfort In Hot Conditions Fully Lined, Smooth Interior Stabilizes And Supports Knee: Fits Either Leg Breathable, open-cell neoprene for comfort in hot conditions Contoured, sized fit Stabilizes and supports knee: fits either leg Fully lined, smooth interior Measure around leg 3-inch above kneecap. Medium fits 14-inch to 15-inch