With 95% bamboo outer AND inner layers, these sleep bags are silky smooth, breathable, ultra comfortable and the perfect addition to any bedtime routine. The only material that comes into contact with your sweet babe is silky soft bamboo. This means that if the weather is warm, you can skip the sleeper and put baby right into their sleep bag in just a diaper and be sure that there's nothing but bamboo rubbing up against them. Designed sleep bags with NO THREADS exposed inside.