The CloudComfort Mattress Booster comes in 5 different sizes. Please refer to the exact dimensions below to find the perfect fit: Single Bed: 91cm x 194cm King Single Bed: 109cm x 207cm Double Bed: 138cm x 195cm Queen Bed: 154 cm x 203 cm King Bed: 184cm x 206 cm Please note, there can be small discrepancies in sizing, +/- 5cm on each side.