The OS1st QS4 Quad Bracing Sleeve is one-of-a-kind as it combines all the benefits of medical grade orthopedic support and graduated compression to support the quad and hamstring while still allowing you to stay active. With four zones of compression, the quad sleeve is effective and provides the support you need while still being thin enough to wear under any active-wear or clothing. The quad sleeve promotes excellent circulation through its shaped to fit design and helps to prevent pain and swelling.