2.5 TOG for extra warmth YKK 2-way zipper Outer & Lining: 100% GOTS certified organic cotton, Filling: 100% polyester Concealed zipper for safety 3-12 months (12-24 lbs, 25-31 in), 12-18 months (22-28 lbs, 30-34 in), 18-24 months (26-36 lbs, 33-38 in)