These sleep bags are the perfect alternative to putting blankets in your babies crib. Super soft bamboo is cozy and soft-to-the-touch for your little one's skin. Each sleep sack has double zippers so you can change diapers during sleeping hours from the bottom of the bag or easy changing from the top. The 1.0 tog is ideal for year round, not too hot yet warm enough to keep your baby comfortable at night. 1.0 TOG: 21 - 23 蚓 / 69 - 73 蚌. Made of 97% bamboo rayon, 3% spandex; filling is 100% polyester by Kyte Baby.