Linning??100% soft, breathable cotton. Shell??80%cotton20%poly.With micro-soft plush.Perfect for three season use. Completely washer safe and BPA, toxin and phthalate free. Exceeds safety standards Hidden inner zipper.Full handmaking top stop. Two-way long zipper extended to back .Easy to put on and off . Pull smooth to prevent zipper stuck because of high quality.Make midnight diaper changes a breeze. Three sizes??S (6-18 months,15-25 lbs, 27-32in), M (18-30months ,25-35 lbs, 32-39 in), L (30M-4Y ,35-45 lbs, 39-45in) Straddling Legs and widening hip. Baby can play and walk before sleeping whether sit or run .When they feel tired they can easy to sleep.