Our deluxe gusset pillows are made using luxurious 100% cotton percale fabric which is treated with a down proof application. This completely encases the filler and prevents fibre migration. The microfill fibre is 3 times finer than conventional fibre, which increases the volume of air trapped between fibres, ensuring maximum comfort. The unique gusset design is sometimes called a 'side sleeper' and is known to retain its shape.