Harwood Textiles Microfibre Mattress Topper - 4ft6 Double; If you are finding your new mattress a bit too firm and dont want to buy another one, try a topper pad thats deigned to offer a softer feel. Generously filled with 1200gsm anti-allergenic hollowfibre fillings, the topper is fully encased in a soft and silky peachskin microfibre cover. The topper is designed to go above your mattress and under your top sheet and is fitted with elasticated corners to ensure it doesnt move.