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. Small size, model 70 designed for babies weighing between 18 and 27 pounds who are generally 6-18 months old and 27-34 inches long.