NWT Set of 3 - see website picture for opened picture 100% Premium Cotton: Soft, breathable, and gentle on sensitive skin, our sleep sack is made of high-quality cotton. Certified to meet Consumer Product Safety Commission (CPSC) standards: We prioritize your baby's comfort and safety. Sleeveless Design: The sleeveless design offers greater flexibility and comfort, and better regulates baby's temperature. A 0.5 TOG is ideal for spring, summer, or fall, or for naps in air-conditioned rooms; it provides year-round comfort for baby. Practical 2-Way Zipper: Diaper changes are a breeze thanks to our durable, high-quality two-way zipper. The zipper design protects your baby's skin from scratches, and its easy glide ensures hassle-free use both day and night. Secure and Comfortable Design: The custom-made neck opening provides a secure fit; the wide hem provides freedom of movement while keeping your baby warm. This carefully chosen design encourages healthy hip development and ensures uninterrupted sleep. Easy Care & Multiple Sizes: Machine washable for easy maintenance: These sleeping bags retain their softness and durability wash after wash. Baby, Infant, Sleep, Naps, Comfort