The 8-15 mmHg support level offers mild graduated compression for mild ankle and leg swelling, mild discomfort, minor spider and varicose veins, and tired, achy legs. Commonly used for travel, mild edema, spider veins & mild varicose veins, 8-15 mmHg offers a great “starting point” for first time wearers. S/M size - fits shoe size 7-10 (Ankle Circ 7' to 9.5') (Calf Circ 12'to 16'). L/XL - fits shoe size 10-13 (Ankle Circ 9.5' to 11.5' (Calf Circ 15' to 19'). Set of 6 Slip-on Imported Material & Care Nylon, spandex Machine washable