Sizes run generous and should last at least 3x as long as traditional sleepers. * Made of 95% bamboo 5% viscose this fabric is buttery soft, and extremely stretchy. * Breathable, thermo regulating, hypoallergenic, and eczema friendly. * Sustainable and eco friendly material. * Last three times as long as traditional sleepers. Stretchy fabric that grows with your child * Cuffs can fold over feet and hands creating a footie pj with mittens. * Double zipper for middle of the night diaper changes. * Snug fit in accordance to CPSC safety regulations.