Silentnight Egyptian Cotton Duvet Range in Single, Double and King Sizes; 10.5 and 13.5 Tog Ratings. Pure Egyptian Cotton cover fabric offers the ultimate in luxury. The soft plain weave fabric gives excellent breathability and extra comfort and softness. The long staple length of Egyptian cotton fibre means the yarns and fabric have superior lustre, softness. The duvet will wrap perfectly around the body. Non-allergenic so it's excellent for allergy sufferers. Duvet has a wavy quilting stitch pattern which help hold filling in place. Outer: Cotton. Filling: Hollowfibre.