Cotton- Super soft, breathable, zero pollution, safe and healthy. 3.5tog-270g cotton filling, suitable for room temperature below 59?H. With adorable design, detachable sleeves, when you remove the sleeve, it can be used as vest sleep bag. Generous sack design provides ample room for movement and proper hip development. Unzips from the bottom for easy diaper changes. The sleeping bag comes with hand cuff to prevent scratches on your baby’s face and sleeves provide extra warmth to keep your baby warm. Size- Small: length — 27 — for 6-12 months — baby height — 25-30; Medium: length — 33 — for 1-2 years — baby height — 28-35; Large: length — 38 — for 2-4 years — baby height — 32-40.