PRICES MAY VARY. MINI PILLOW 8"x8" Poly-Fil Polyester fiberfill Pillow Insert. 100% Polyester Fiber - Non-Allergenic. This is a nice, fully filled insert. ***We provide a true 8x8" insert. When measured across the pillow, it measures 8" x 8". We recommend you choose a pillow insert that is one size bigger than the pillow cover so that the end product is nice and full.