Preggers by Therafirm Maternity Casual Support Socks featuring Core-Spun technology are designed to help prevent edema, leg discomfort and deep vein thrombosis for long distance travelers and to help promote better blood flow, prevent mild swelling, and relieve tired, achy legs and feet. The Core-Spun yarns make the support socks easier to get on which is a huge plus for pregnant women. They look and feel like a soft, comfortable everyday sock with the added benefit of true graduated compression. Great to wear during and after pregnancy with tennis shoes or boots.