Ergopouch Description: Our Jersey Sleep Sack is a baby and toddler sleep sack designed for arms-out sleepers (usually from around 3 months of age). The Jersey Sack has a slim-fit, stretchy design similar to that of a swaddle and is recommended as baby's 'first sleep sack' after the swaddling phase is over. The safe-sleep approved design is made from soft, stretchy GOTS certified organic cotton that is non-toxic and gentle of baby's skin. The 3.5 TOG sleep sack with sleeves is a warm winter sleep sack for babies and toddlers, perfect for keeping a child warm overnight in winter, in rooms 57-70°F. The long sleeves on the Jersey Sleep Sack are rated 1.0 TOG and provide extra warmth on cooler nights. The TOG rating means that there is no need for additional blankets in the crib when using this product, making it a safe-sleep option. Parents can be rest assured that the breathable organic, natural fibers will help regulate their child’s temperature and prevent overheating.