How thick is the Endy Mattress? Melissa 12 July 2018 15:36 Updated Every size of our mattress is 10 inches in height. Related articles Will I feel any motion transfer on the Endy? How much does the Endy weigh? Can you tell me more about Endy's foam? What makes the Endy Mattress unique? Do you carry a Single or Double size Mattress?