The Health+ Allergen Control Pillow is constructed from a 300-thread count soft jacquard shell, a woven material with proven durability. The hollow-slick polyester fill is a resilient material that maintains its volume and promotes air circulation which reduces heat build up, providing you with great comfort for a good night’s rest. The antimicrobial fill fibers also resist moisture that causes bacterial growth, mold mildew, and dust making it hypoallergenic.