Footie's practical hidden 2-way zipper with an inner placket to protect your baby's skin opens from neck to foot. It has mitten cuffs on sizes N (newborn) and 1 month to prevent scratching, and has an anti-slip feature under the feet on sizes 3 months to 18 months. The back of the foot has a soft elastic to ensure that baby's foot stays where it belongs! The fit is snug on sizes 12m and 18m, and no flame retardant chemicals are used. The fabric is a blend of organic cotton and TENCEL™ modal, ensuring that no pesticides or chemical fertilizers were used, and that the processes are sustainable.