Three decades ago, Terramar introduced pure Chinese silk underwear to the American market under the Thermasilk® brand. Today, we're the world's largest importer of silk and with good reason. Silk is nature's perfect product. It's lightweight, durable and comfortable. It's a natural insulator and a renewable natural resource. Now, Terramar technology has made it even better - with pure and blended silk combinations engineered to keep you comfortable, no matter what Mother Nature has in store.