We use STANDARD 100 by OEKO-TEX® certification on products tested in an independent laboratory against a list of more than 400 harmful substances, including PFAS. Pair with our Onesies® Bodysuits or Solid Essentials for an extra layer of warmth! Materials: Body Fabric: Waffle 65% Cotton, 35% Polyester Ribbed Cuff/Waistband Fabric: 97% Cotton, 3% Spandex