This is a set of two baby sleep sacks, size M, made of 100% cotton, featuring a cute hot air balloon and bear pattern. - Brand: Coperta - Size: M - Material: 100% Cotton - Design: Hot air balloon and bear pattern - Quantity: Set of 2 I bought one when my baby was one month old because they couldn't sleep due to the Moro reflex and would cry at night. When I received it and put it on, the crying stopped, and I used it constantly. I bought a second one because one wasn't enough, and I used them interchangeably. I stopped using them when my baby started rolling over. Moms who are currently struggling with nighttime crying, please consider buying these. It may depend on the baby... I truly believe I was happy to have bought these! Since they are size M, they can be worn for a long time! The two zippers make changing diapers easy! Instant purchase with no comments is OK. Also listed on other sites, so first come, first served. Thank you for looking.