Which? Best Buy endorsed
With the King Arthur mattress, you can sleep easily knowing it's Which? Best Buy endorsed. The King Arthur has undergone rigorous testing to ensure the mattress's suitability and a Which? Best Buy rating. The testing criteria revolve around breathability, stability, body support, and whether you can turn on the mattress easily. To assess the mattress for back support, Which? measures the shape of a person's body at 36 different points when standing and then when lying on their back on the mattress. Similarly, they measure the position of their spine when lying on their side to check that no part of their body sinks too far into the mattress. Other testing procedures include specially designed equipment to assess whether the pressure is evenly distributed across the mattress surface and specially designed humidity chambers to measure how much moisture can pass through the mattress's layers. To test the mattress's durability, heavy barrels are run back and forth across the mattress thousands of times to simulate approximately ten years of use.