Hypoallergic: Plus, it's hypoallergenic for comfort guaranteed! Material: Cover made from 100% cotton with a 7cm duck feather and down filling. Elasticated strap : With an elasticated strap for a secure fit. Sizes: In a choice of single, double, king or super king. Mattress topper: Get a 7cm thick duck down and feather mattress topper! Soft: Enjoy a cushony soft feather filling all night long! Duck Feather & Down Mattress Topper | Living Social