Always keep your little baby warm, whether at home or outside. This wool sleeping bag is made ofAustralian merino wool lining- 100% natural, luxuriously soft, hypoallergenic and temperature regulating. the premium fabrics for the best comfort. the 100% cotton inner material to provide ultra-soft material, even touch directly to the skin. Exceptionally breathable merino wool lining regulates body temperature so it can be used in all 4 seasons (suggested dressing guide included), and it's great gift for toddler 2-4 years old.