These pieces will vary slightly in size from 34-40 inches. 100% pure silk 1.Wearing silk in your hair can help keep it soft, mouisturised and tangle free. 2. Silk is much more delicate on the skin than cotton. Silk helps retain your skins natural moisture. 3.Hypoallergenic. Silk has a natural resistance to dust mites, fungus and mold, in addition to many other allergens.