This lustrous luxury blend yarn of silk and cotton creates versatile trans-seasonal garments. Its rustic tone-on-tone appearance enhances the natural color range. A terrific way to enhance Teva Durham's original Birch yarn in the new version appropriately called New Birch is to increase the luxurious silk content yet keep the price the same! We love the added softness and subtle sheen from the much higher percentage of silk, and they've also kept the rustic look that's been so popular. New Birch is totally interchangeable with original Birch in Teva's lovely patterns.