Product models containing "F" indicate that either the backrest cushion or the seat cushion contains goose feathers.
Product models containing "FF" indicate that both the backrest cushion and the seat cushion contain goose feathers.
Product models containing "S" indicate that either the backrest cushion or the seat cushion contains space fibre.
Product models containing "SS" indicate that both the backrest cushion and the seat cushion contain space fibre.
Product models containing "M" indicate that either the backrest cushion or the seat cushion contains memory foam.