Shop Mattresses by Size The first thing to decide when choosing a new bed and mattress, is the size. For the best nights sleep, we recommend buying the largest bed that your space and budget allows! SINGLE MATTRESSES 188cm x 92cm LONG SINGLE MATTRESSES203cm x 92cm KING SINGLE MATTRESSES203cm x 107cm DOUBLE MATTRESSES 188cm x 135cm LONG DOUBLE MATTRESSES203cm x 137cm QUEEN MATTRESSES203cm x 153cm KING MATTRESSES203cm x 167cm SUPER KING MATTRESSES203cm x 183cm CALIFORNIA KING MATTRESSES203cm x 203cm TRUNDLE BEDS & BUNK BEDS