Luxury Microfibre “Soft as Down” Duvets – 10.5 or 13.5 Tog | Single | Double | King. Microfibre Duvet – Soft, Warm & Hypoallergenic Comfort. Why Choose Our Soft as Down Microfibre Duvet?. Filled with ultra-fine microfibre that mimics the luxurious feel of natural down, this duvet provides gentle warmth and an irresistibly soft drape.