The Zelkii Bamboo Sleep Sack – Teddy is an investment in better sleep, for both you and your baby or toddler. We've sourced premium quality components to create a garment that is exceptionally soft, highly practical, and uncompromisingly safe. The foundation is our 95% bamboo viscose, a fabric chosen for its superior thermo-regulating properties and buttery-soft feel against sensitive skin. We then paired it with a world-class, two-way YKK zipper for unmatched durability and silent, easy nappy changes. But quality is more than just good materials. That's why we've ensured the entire product is Oeko-Tex Standard 100 certified. This stringent, independent testing means you can be confident it's completely free from harmful substances. The result is sleepwear that gives your little one unparalleled comfort, and gives you complete peace of mind. Key Features: Silky-Soft Fabric: Made from 95% bamboo viscose and 5% spandex for the perfect blend of softness and stretch. Oeko-Tex Standard 100 Certified: Proven to be safe, non-toxic, and gentle on your baby's or toddler's delicate skin. Premium YKK Zipper: Features a two-way zipper for easy changes, plus a zipper garage for added protection. Thermo-regulating: Bamboo's natural properties help keep your baby or toddler cool in summer and warm in winter. TOG Rated: 1.0 TOG-rated.