Disana organic boiled wool sleep sac combines the best of both natural fibres. The outside, made of soft boiled merino wool, provides plenty of warmth without overheating. Wool is good at balancing temperature; baby never gets too warm or too cold wearing it. An extra fine organic cotton lining on the inside allows baby to sleep in peace. Thanks to the long zipper in the front, the sleeping sack can be opened wide. This makes it easier to place your child inside when asleep. Size 1 - 0-6 months, Size 2 - 6-18 months, Size 3 - 18-3 years. The baby picture is wearing a Disana sweater, a warm and breathable covering on the arms and chest.