Moms love our luxuriously soft and breathable short sleeve pajama set. It's made of high quality bamboo rayon fabric. Fabric: 97% rayon from bamboo 3% spandex. Features: - Snug fit for safety and warmth; - Stretchy bamboo rayon fabric for extra comfort and movement; - Snug fitting to comply with the CPSIA regulations (Consumer Product Safety; Improvement Act in USA) and Health Canada Children’s Sleepwear Requirement.