Are you worried about which baby sleep bag to use and whether your baby will be too hot or cold while sleeping?With Woolino there is no need to worry because the exceptionally breathable Merino wool naturally regulates baby's body temperature to ensure s/he sleeps comfortably through the night.This luxurious baby sleeping bag will also save you buying lots of other brand sleep sack TOG ratings because it can be used year-round.With Woolino wearable blanket your child will have an amazingly comfortable sleep, which will give you a peace of mind and a good night sleep as well.• 100% NATURAL: Silky-soft Australian Merino wool lining & organic cotton outer • CAN BE USED IN ALL 4 SEASONS - suitable for room temp. 63-77F (17-25C) • Unlike any other fiber, Merino REGULATES BODY TEMPERATURE keeping baby warm when it's cold and cool when it's hot • Openings for feet allow for mobility when child is awake• Zipper-pull guards to protect child's skin• Generous size so child can tuck feet in when sleeping • MACHINE WASHABLE and can be tumble tried on low• Nursery thermometer with dressing guide included • Woolmark certified Merino. GOTS certified organic cotton. • Setting the standard for textile safety, from yarn to finished product, this product bearing the OEKO-TEX STANDARD 100 label (23.HUS.59156, Hohenstein HTTI) has passed safety tests for the presence of harmful substances.Why Merino? A study done by University of Sydney, Australia has found that a better night's sleep is achieved when sleeping in or under wool. Significantly finer than other types of wool, Merino is the perfect fiber to have next to child's sensitive skin. It breathes, regulates temperature, manages moisture, it is easy to care for, and durable. It is naturally perfect.