ErgoPouch Cacoon Swaddle Bag 0.2tog - WillowThe Sleep Sack is an arms out Sleep Sack for infants and toddlers. It's slim fit shape and stretchy organic jersey cotton material are similar to the fit and feel of a swaddle to help ease the transition out of swaddling to arms out sleeping. We recommend this product as baby's first Sleep Sack, after the swaddling newborn phase is over. Previously named Jersey Sleep Sack; packaging may have either product name. Materials 95% Organic Cotton 5%