Tested by athletes, self-activated by performance. Wrapping your lower leg in air, the lighter-than-light S/LAB NSO calf keeps you feeling supported yet comfy. And to maintain your natural balance, athlete-driven eNosyntextechnology helps reduce fatigue and speed up recovery. So, you can give your best, every time.  Positioned on the bodys natural trigger points, the integrated, breathable NSO patches help improve muscle tone, micro blood circulation and cellular balance for faster recovery and performance. Providing light compression, this calf dries quickly to keep you feeling your best. The ultra-light, stretchy Payen Altitude fabric has comfy elasticated seams and mesh inserts, as well as silicon-free Faitplast tape on the lower hem to ensure it stays put. NSO: Developed over more than 10 years with insights from leading athletes, eNosyntextechnology reduces fatigue and restores balance using infrared reflection through metallic oxides. Size and fitHow to choose your calf size