See photos for wear & tear in lining - lots of great years of use left but some of the stitching is loose from repeated washing (see photo). Listing for less than my other sleep sacks b/c it was my daughter's fav and therefore most worn :-) From website: “The wearable blanket that gives you peace of mind and helps your baby sleep through the night. The one that started it all: Our most-loved, best-selling sleep bag. A wearable blanket that helps baby fall asleep (and stay asleep), so you’re not up all night. Designed to be safe sleep, diaper change friendly, temperature-regulating, and so soft you’ll have to touch it to believe it. Exterior: 97% Rayon made from Bamboo, 3% Spandex Filling: 100% Polyester Highly breathable J-shaped double zipper Use as a wearable blanket over pajamas for safer, cozier sleep"