So I've ordered a new mattress and Id like to make it last as long as possible and also as comfy as possible, without being too hot. I fancy a feather topper as memory foam seems to be too hot for a lot of people, but... I'm mega skint at the mo and want something cheap. Does anyone know if mattress topper is worth it? And also am I just as well being a single feather duvet and sticking it under my sheet on double bed instead of topper?