Pillowflex 95% Feather by 5% Down Pillow Form Insert Stuffers for Throw sham Covers and Cushions (24 Inch by 24 Inch) Use the yellow sizing chart image to the left to select the best size insert for your sham, this 24x24 insert is recommended for use in a 22x22 sham. 95% Grey Duck / 5% Duck Down. Covering is 100 Cotton Great loft for a full sham, keep your shams looking plump and new! Fluff for a traditional look or give the pillow a karate chop look Long lasting / Spot clean only