The Infantino StayCool 4-in-1 Convertible Carrier features our StayCool future fabric that's measurably cooler than other leading carrier materials, including standalone mesh, so you can stay comfortable and cool on even the hottest days. It can be used from 8 pounds up to a weight of 40 pounds, making it ideal as your baby grows from an infant to a toddler. It is also adjustable to ensure a perfect fit for each individual child