6 Thirsties diaper covers Size One - fits 0-9 months 6-18 pounds Gently used, non smoking home. Always washed with Esembly detergent and air dried. Pliable and breathable wraps provide an ultra-comfortable waterproof cover for fitteds, prefolds, and flats. Trim fit Leg gussets for advanced leak protection. 100% polyester with waterproof TPU laminate FREE of VOCs, PVC, phthalates, lead, PFAS, and latex.