We love Aden + Anais Muslin Wearable Blankets! The material is long-lasting and durable. We like that the material doesn't hold in odors and airy. The fabric is very lightweight but keeps the baby warm, not too hot. Our 3rd child is a 35-week premie and has been using this as a sleep sack for almost 5 months now. It zips from top down. So baby can stay in the sack when changing her diaper. We LOVE it! Highly recommend as a gift and would buy again.