Small bedroom or a solo sleeper? Then a single mattress is probably just what you need. We have a limited selection of small single mattresses which measure 75cm x 200cm available at great prices. This is the nearest equivalent to what used to be traditionally known as a half king mattress. Two side by side equal a standard king size. Scroll to the foot of this page for more tips to help you pick the right option. Even in Special Offers, mattresses featured here are included in our 100 night trial.