Our Cotton Dot Tassel Cushions and Cotton Dot Ottomans do not come with an inserts. For the Tassel Cushion any 50x50cm cushion will fit. The Cotton Ottomans come with an insert bag in which you could put styrofoam beads. We like to use old doonas, cushions and blankets to make the ottomans as soft or firm as you like. Our shell cushions do not require an insert as they are stuffed cushions.