PREMIUM KNIT FABRIC - Our zip-up footie pajamas are made from the same ultra-soft and stretchy material as our beloved knit swaddle blankets. Both lightweight and breathable, the premium fabric promotes a cool and comfortable night’s sleep. Wash before use to ensure the best fit and softness for your little one. BONUS FEATURES – Our zip-up footie pajamas feature a comfy, tag-free neck for ultimate comfort, as well as a two-way zipper for easy diaper changing.