This was received as a gift. Only one (one side only) Lightweight and breathable, all-season compatible: Lightweight and breathable, very comfortable in spring and summer. Silicone gasket shock absorption protection: 3D ring wrap fits the knee. Four-sided elasticity and stable compression: Comfortable, tight, and stable leg muscles. Non-slip silicone prevents slippage: Double silicone non-slip strips increase friction. Spring support memory fish scale: Springs are placed on both sides to support more distributed pressure. Layered compression for stability: Springs are placed on both sides to distribute pressure and provide more support.