Activa class 3 thigh support stockings 25 35 mmhgfirm compression for severe varicose veins and dvt the firm graduated compression makes activa class 3 thigh support stockings the ideal hosiery if you have severe varicose veins or advanced dvtcombining ultra fine nylon and the smooth stretch of lycra soft even with firm compression these stockings are luxurious comfortable and easy to put on thanks to new designs technology and yarns activa ensures a high quality product that boosts yo