What sizes do they come in? Simba - Odyssey January 15, 2018 16:58 Follow We offer the Fitted Sheet in UK sizes Single, Double, King and Super King. Related articles Will you be releasing any other bedding to go with the sheet? How deep is your mattress, will my sheets fit? What makes the Simba sheet special? Can you make bespoke mattresses? What sizes do you offer and will this fit other mattresses too?