Feather Sleeper A warm sleeper made in Japan with high-quality double gauze and 85% white duck down. This sleeper, a wearable swaddle, offers comfortable breathability and moderate warmth. It does not use any chemicals containing formaldehyde, harmful chemicals that come into contact with the skin, or finishing resin agents. It's gentle gauze that's safe for babies. Size: Length: approx. 62cm / Width: approx. 37cm *Some shrinkage may occur due to washing. There are no noticeable stains, but there is some pilling and fluffing. It seems warm, like a futon made into a sleeper.