Down and feather - usually combined in varying amounts to create the right support and comfort. Down is fine, soft and springy. Feathers add weight, firmness and support.Wool, tencel, silk and cotton - generally firmer as they are more naturally compressed.Hollowfibre - a hollow thick synthetic fibre which is lightweight but firm.Microfibre - a much finer synthetic fibre which is soft and silky.Memory foam – which contours to the shape of your head.