The Swaddle UP is the only zip-up swaddle available that allows your baby to sleep in the arms UP position. The Swaddle UP requires no complicated wrapping, so everyone can swaddle right every time. Need more sleep? Swaddle UP!Why arms up?It is your babys natural sleep position that allows your baby access to their hands for self-soothing. Babies often use their hands to settle themselves to sleep, by sucking on their fingers or gently rubbing their cheeks. Medical research suggests that babies sleep better, & for longer, if they are able to self-soothe.Features:Snug fit makes your baby feel secure & helps to calm their natural startle reflexEliminates excess loose fabric in the cribWings prevent face-scratchingMay reduce the risk of your baby accidentally rolling onto their tummyGenius two-way zipper for easy diaper changesHip-healthy design allows hips and legs to flex naturallyMaterials: 93% Cotton, 7% Elastane.