RelaxSan open-toe medical compression maternity tights provide moderate graduated compression (15-21 mmHg - Class 1), which encourages the return of blood to the hearth. They are recommended to reduce symptoms of swelling and heaviness of the leg, treat mild varicose veins and venous disorders, and prevent embolism and thrombosis. These graduated compression maternity tights are very comfortable, long-lasting and opaque thanks to the soft microfiber contained in their fabric, while the reinforced heels and invisible flat seams guarantee maximum comfort and durability. They also feature a comfortable elastic top that moulds to your body in order to accommodate the baby during all stages of pregnancy.