The literal best zip up onesies out there! Stretchy and last forever! Made from custom-milled Lunaluxe™ Bamboo that’s gentle on sensitive or eczema-prone skin Seasonless fabric keeps them cool in the summer & cozy in the winter Fold-over mittens (up to size: 12-18 months) for scratch-free sleep Fold-over foot cuffs (on all sizes) easily convert from footless romper to footed sleeper Double zipper makes diaper changes a breeze No snaps, buttons or interior tags Fits up-to-3x longer than the average sleeper * Snug fit in accordance with all CPSC safety regulations. Our pajamas are never treated with flame-retardants or chemicals!