Thermarest prolite 3. Need I say more. Get the 3/4 if you're into the whole masochist thing. This mat sees me through the whole year. If it gets really cold I stick it in one of those foil emergency bivvies ( i use an adventure medical kit one these days, weighs nowt) for instant 4 season use. Lifetime guarantee and they are really comfortable. Just repaired the mrs mat with a bit of seallant and it seems fine. Just needs a field test now.
