The back is mesh, which is cool and breathable, and the size is adjustable, making it convenient. Home cleaned! Please consider this item, as it is a used item inspected and stored by a non-professional. I have guinea pigs, but the item is stored in a separate room. I am also selling on other sites, so please comment before purchasing. Feel free to ask any questions! #BabyHat #BabyCap #Hat48cm #BlueHat Blue baby hat with a mesh and fabric stripe design. - Brand: chipper.B - Color: Blue - Material: Mesh and Fabric - Design: Stripe Design - Size Adjustment: With back strap Thank you for viewing.