The ergoCocoon 'no origami' baby Swaddle Sleep Bags are designed to be both easy to use and difficult to escape from. The simple zip up design will keep baby snug and securely swaddled without the need for complicated wrapping. The 2.5 TOG ergoCocoon Swaddle Sleep Bag is designed for Winter temperatures and is made from an Organic Cotton jersey outer layer and is filled with 100% organic cotton for warmth. Main Features: Organic stretch cotton with an inner layer of super soft stretch Bamboo Viscose terry at the top and filled with organic cotton at the bottom. Skin-friendly, breathable natural fibres. Poppers in the armholes to help you transition your baby to arms free 2-way zipper for easy nappy diaper change Best for sleeping in 17c-23c (64F-73F) room temperature. Snug for Winter.