100% Cotton TRANSITIONAL SWADDLE SACK promotes BETTER SLEEP and SAFER SLEEP. Perfect for babies who like to sleep with ARMS UP, babies starting to or able to ROLL OVER, babies who like to suck on hands to SELF-SOOTHE, and for babies who get out of a classic swaddle LITTLE SLEEVES with BIG PURPOSE. Unique ARMS UP 1/2-LENGTH Sleeves with mitten cuffs closed provide gentle suppression of Moro/Startle Reflex, so BABY SLEEPS BETTER. If baby rolls over, sleeves allow baby to use arms and reposition, so BABY SLEEPS SAFER Recognized by IHDI as HIP HEALTHY. Safest & Easiest Way to transition baby from a full arm-restraining swaddle. TSS is not a tight swaddle nor a loose sleeveless wearable blanket. TSS supports baby in natural and flexed position to help baby feel secure. DESIGNED BY A NURSE with Baby's Best Interest in Mind. FOLDOVER MITTEN CUFFS may be worn OPEN OR CLOSED. Caregiver can open one or both cuffs, so baby can SELF-SOOTHE, or close the cuffs to PROTECT BABY FROM FACIAL SCRATCHES 100% Cotton. TOG 0.5 Soft stretchy fabric. 2-way double-pull zipper for EASY DIAPER CHANGES. Use baby's weight to select size: S 6-14 lbs 0-3 mo; M 14-21 lbs 3-6 mo; L 21-24 lbs 6-9 mo. Machine wash. Tumble dry. US Patent 11,812,795 WW patents online