The Halo Sleep Sack Swaddle is a pre-owned baby sleeping bag designed for infants aged 0-3 months. The swaddle is made by the brand Halo and features a "Back Is Best" design to promote safe sleeping. The swaddle is designed to keep babies warm and snug while they sleep, and it is made from soft and comfortable materials. The swaddle is a type of nursery bedding and is specifically categorized as a sleeping bag or sleepsack.