Made with fine and breathable 100% merino wool, it helps to keep your baby warm when it is cold and cool when itâ??s warm. This temperature regulation means that your baby will sleep comfortably throughout the night and that means a better nightâ??s sleep for you too. It comes in a universal size that fits babies from 2 months to 2 years. So, instead of buying a different sleeping bag for different seasons, as well as buying larger ones as they grow, you just need one BabyChuckles sleep bag for your baby, up until they turn two! Sleep bag Temperature guide: the BabyChuckles 4 Season merino Sleep Bag can be used year-round. Itâ??s suitable for room temperature 63-75F (17-24C). Because of merinoâ??s unique ability to regulate body temperature. Material: 100% Organic cotton with Organic dye printed - 180 GSM 100% Merino wool Natural - 260 GSM Why Merino Wool: Anti-Bacterial, Odor-resistant, Thermo-regulator, Moisture control, Breathable, UV-Protection Size: As for the size of our merino baby sleeping bag, the length is 91 cm (35.4 inches) and the width at the feet is 46 cm (18.1 inches). Key Features: 1) 100% Natural Silky-soft hypoallergenic merino wool lining. 2) Finest 100% organic cotton with organic dye printed outer fabric. 3) For the stitch(trims) we use 100% organic cotton, we offer finest natural fiber material to your baby. 4) This can be used for babies 2 months up to 2 years old. For smaller babies, simply close the underarm snaps to adjust the fit. 5) Natural & bio degradable, good for both Babies & Earth. 6) Lead & Nickle free snap buttons, YKK Zippers 7) Helps your baby stay covered through the night, replaces loose blankets in the crib and promotes back sleeping. Washing care of the product: When necessary, Wash in the hand wash cycle or wool cycle in the washing machine at room temperature and to be flat dried.