Our Jams are made from bamboo viscose that is buttery soft. It's incredibly soft feel makes it the perfect material for sensitive skin. -Tag less design for ultimate comfort for your little. - Heat regulating fabric design keeping your little one warm in the winter and cool in the summer. - Made to grow with your child. Our bamboo viscose jams are so stretchy they will fit longer than any other jams you own! - 95% bamboo 5% viscose - machine wash cold, tumble dry on low heat.