Activa Sheer Therapy Women's Dress Socks 15-20mmHg Activa's Sheer Therapy® graduated compression is designed to give 15-20 mmHg support to help prevent and relieve tired, aching legs, ankle and leg swelling, and slight varicosities. The sheer style and classic knee high length is ideal for daily wear and goes well with any outfit. Sheer, silky look and feel. Reinforced toe and foot. Prevent medical issues for those with risk of vein health issues Prevent varicose veins and swelling during pregnancy