SleepingBaby Zipadee-Zip Transition Swaddle and Snuggle Strap Bundle. Size Small- 4-8 months. Cozy Zipadee-Zip Sleeper: Our comfortable Zipadee-Zip swaddle transition sack acts as a wearable blanket that not only keeps your baby cozy, but acts as a swaddle transition as well. The unique starfish design provides the comforting, enclosed feeling of the swaddle but without limiting your baby’s full range of motion. Thin cotton feel polyester. Some pilling/wash wear but otherwise in excellent condition. This worked SO WELL for our daughters swaddle transition.