Feather and down pillows can lose their shape over time but bounce back pillows are filled with a polyester hollow fibre that creates down like softness for a truly comfortable sleep the filling and polycotton casings have anti allergenic properties to eliminate mould mildew bacteria dust mites and dust mite allergens perfect for allergy and asthma suffererskeep their shape night after nighteach pillow measures 736 x 482cm 29 x 19hand wash or dry cleanset of two