DREAMLAND BABY Bamboo Viscose Swaddle Sleep Sack (0-6 Months). Ultra Soft Swaddle Blanket w/Built in Band. 97% Viscose, 3% Spandex (Ocean) I have only used this twice and washed it each time. You can see some peeling, but that just happens with all of these sleep sacks in the washing machine. I really liked it, but I preferred the weighted one. This one is not weighted, but does have the built-in swaddle