Ideal for the treatment for varicose veins, phlebitis, oedemas, thrombosis, and chronic venous insufficiency. Perfect after surgery to help prevent blood clots. Reinforced heel and toe for maximum comfort, durability and fit - High quality, 100% Made in Italy To CHOOSE THE RIGHT SIZE for you, please pay attention to the SIZE CHART among IMAGES. Material: 76% nylon, 24% elastane Material Composition: 76% nylon, 24% elastane Care Instructions: Hand Wash Only Style: 950A RelaxSan 280 denier open-toe support knee high socks exert firm graduated compression of 22-27 mmHg. They are ideal for people suffering from poor blood circulation, varicose veins, phlebitis, oedemas, and chronic venous insufficiency. These open-toe support knee highs are also perfect to prevent thrombosis after surgery. They feature reinforced heels for maximum comfort and durability and soft elastic top bands, which do not squeeze your calves. Fabric content: 76% nylon, 24% elastane Size guide: Size 1: Ankle Girt: cm 18-20,5 (in 7-8) Size 2: Ankle Girt: cm 20,5-23 (in 8-9) Size 3: Ankle Girt: cm 23-25,5 (in 9-10) Size 4: Ankle Girt: cm 25,5-28 (in 10-11) Size 5: Ankle Girt: cm 28-30,5 (in 11-12)