Certified by GOTS and OEKO-TEX. Kaiya Angel swaddling sleep sacks are made of 100% organic, natural fabrics: organic cotton and bamboo fiber. The buttery-soft feeling gives babies a super comfortable feel. The unique design helps your sweet heart sleep in a natural ARMS UP position. The ARMS UP position is also a safe sleep position that can prevent babies from SIDs. It is ergonomic with an anti-startle reaction.