FAQ THE MATTRESSES DO YOU MAKE CUSTOM SIZE OR RV MATTRESSES? SEE ALL QUESTIONS DO YOU MAKE CUSTOM SIZE OR RV MATTRESSES? We only offer standard North American mattress sizes. As a smaller company we’re currently unable to produce custom sizes — so sorry about that! YOU MAY ALSO LIKE What are the dimensions of the Casper mattress? What is the difference between a King and California King? Where are Casper mattresses made?