Kyte baby and Gunamuna are my favorite sleep sack brands. Both are made from Rayon that’s derived from Bamboo. I love the 1.0 TOG that is a true TOG. It keeps my baby warm and cool when the temperatures shift. I love the double zipper for both sacks as well. Kyte baby, gunamuna, sleep sack, swaddle, baby, baby sleep, bamboo, rayon, double zipper, mom, mama LTKBaby