The sleeping sack is certificated by Oeko-tex Standard 100, made of organic cotton, safe and comfortable. Open legs design: Perfect for mobile child or toddler. Three way zippers: Unzips from top and bottom for easy dressing and quick diaper changes. High quality YKK zippers are well made, will not broke. Long sleeves: Sack for toddler sleep winter approx. 2.5 tog suitable for room temperatures 64°F- 70°F. Large size, model 90 designed for babies weighing between 32 and 45 pounds who are generally 2-4 years old and 35-42 inches long.