Just bought the mattress protector to go with my light wool Duvet. It is a great fit on my 10inch mattress which has a 4 inch memory foam topper. The wool Duvet is the best one I have ever purchased. No more having my husband pulling the Duvet off me, it just seems to wrap itself around me. Have bought the Summer single for my son who says how comfy it is. Will be buying the extra light double next Summer or before if the Light one is not warm enough for the Winter then will add the two together. The Woolroom also uses the best courier DPD who send you an hour time slot.