Made from an all-natural viscose bamboo blend, this fabric will keep your toddler through "big kid" cool yet cozy at the same time -- yep, it’s temperature regulating! The silky-smooth fabric is soft, breathable and comfortable, making it the perfect choice for the most sensitive skin. Our 2 piece bamboo sets are designed with the details in mind. * Super stretchy neck holes to easily pop over heads without a battle * Elastic waistband is sewn to the fabric to prevent it from twisting up and becoming uncomfortable against little one's tummy * Cuffs at ankles and wrists prevent hands and feet from becoming covered and can be folded over as needed (meaning you can wear these 2 piece sets longer!