Silky Smooth Rayon made from Bamboo Fabric Our Sleep Bags are made from our signature Rayon derived from Bamboo Fabric, the softest fabric you will ever feel. Hidden Zipper We added a zipper flap to the top of the sleep bags to avoid irritation while your little one sleeps. Classic Quilting Our 1.0 Tog and 2.5 Tog Sleep Bags are quilted inside to prevent the inner-lining from bunching up, maintaining the quality of the product. Rainbow of Color Options Our sleep bags are available in a wide rainbow of colors and modern prints.