Benefit Wear Back Zipper One-Piece Kids Onesies-Like Underwear Features a long back zipper from neckline thru waist Tab and snap closures at the back neckline, making it more difficult for the wearer to open and remove Elastic at sides of waistline gives the jumpsuit more of a fitted shape and body Can be worn as is, as an undergarment, or with clothing, pajamas layered over it. XS(3-5) S(6-8 ) M(10-12) M(10-12) L(14-16) XL(18)