0.5 TOG, perfect for summer or winter YKK 2-way zipper 100% GOTS certified organic cotton 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)