Made from soft fine pure cotton this baby sleep sack is breathable and helps wick away moisture making it gentle enough for baby sensitive skin. Each set includes one print and one solid design offering a cute and convenient spare option that works well for both baby boy and girl making it easy to rotate and a true nursery essential. Made with lightweight fabric it provides a comfortably cool sleep environment for baby on warm spring and summer nights and when temperatures drop in autumn and winter you can simply layer a sleeper or a onesie underneath to easily adjust warmth making it suitable for year round use. The roomy leg design supports natural hip movement and gives your baby plenty of space to crawl kick and move freely and the two way zipper allows for quick diaper changes from the bottom helping baby stay asleep through the process. These baby wearable blankets are CPSC compliant and CPC certified meeting standards for fabric and workmanship.