The Koo-di SleepSacs have a unique combination of special features making it a bedtime essential. Soft fabric zip guards prevent zips scratching babies soft skin and opens at the front for easy night changing. The Natural Bamboo Lining absorbs 60% more moisture than cotton, and dries 20% faster than cotton. Bamboo is naturally anti-bacterial, so there are no nasty chemicals next to babies skin and it beautifully soft and silky. These sleeveless SleepSacs are anti-allergenic, have an anti-bacterial filling that helps to prevent build of bacterial and dispels dust mites that are linked to Asthma and Eczema. This 1 tog sleeping bag is lightly padded and suitable for use in warmer weather and room temperatures between 18 degrees and 24 degrees. 100% cotton outer with silky soft bamboo lining, these SleepSacs are machine washable at 40 degrees.