Safe and exclusive design without snaps Protected chin Machine wash in cold water delicate cycle. Dry at low temperature Designed and tested in labs by a third party to make sure that no detail is left out for your baby's safety This 0.7 TOG sleep sack is just perfect for spring and summer. Made of breathable, light 100% cotton muslin, it is soft on baby's skin. Plus! It will get softer every time you wash it.