These comfy pillows are made from non-allergenic materials and are filled with durable polyester fibre. This means fleas will not breed or live in this pillow thus helping to curb the spread of this troublesome parasite. As an extra feature, these pillows come complete with a zip for ease of topping up or refilling, and a great idea for summer is to wet the pillow… it then makes a great cool spot on those stinking hot days!