Same or next day shipping This is a bundle item If your hat isn't a snug fit, the hat filler is for you... Please note: filler is applied to the inside of the hat crown, under the sweatband lining. Made of foam cushioning, the adhesive filler sticks to the inside of your hat (the wool OR straw) for a better & smaller fit. Reduces hat size by approximately 1-2.5 cm. Can be used the whole way around your hat or just partially, if you are only wanting to reduce your hat size by a small amount.