Product details:

Merino Wool For infants 4-30 lbs. and 19-32 (included infant insert for use with smaller babies). Flame-retardant free (FR-free). Luxuriously soft, our fine Merino Wool blend textile offers excellent airflow and absorbs moisture, so your child rides along comfortably. Merino wool reacts to changes in your childs body temperature and provides thermoregulation in any season or climate. Merino Wool is a natural material with hypoallergenic properties and may be a good option for babies with sensitive skin or allergies to other fabrics.