30-40 mmHg compression helps prevent and relieve severe varicose veins, treats severe edema and lymphedema, supports post-surgical and post-sclerotherapy treatment to prevent the reappearance of varicose and spider veins, reduces symptoms of orthostatic and postural hypotension, manages venous ulcers and manifestations of post-thrombotic syndrome (PTS), and prevents deep vein thrombosis (DVT), also known as economy class syndrome.