Three decades ago, Terramar introduced pure Chinese silk underwear to the American market under the ThermasilkÂ® brand. Today, weâ~@~Yre the worldâ~@~Ys largest importer of silk and with good reason. Silk is natureâ~@~Ys perfect product. Itâ~@~Ys lightweight, durable and comfortable. Itâ~@~Ys 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.