Lebar Singapore 409015. Featuring best in class performance technologies to give your body the rest it deserves with premium foams. or Best Offer. When it comes to their mattresses, they offer mostly hybrid mattresses with pocketed coils.Most customers are initially comfortable with these mattresses and report good things, but there are some complaints about the quality for the price. King Koil is an American mattress brand so most of their manufacturing compounds are located in the United States. kingkoil.com. online exclusive. That’s why the King Koil brand promisesmore than a mattress. Beddings Sleeping in has more reasons. Play video. How much is a KingKoil bedding? King Koil Mattresses. King Koil mattresses are sold at retail stores nationwide. Secure shopping Bed size guide All help & FAQs Contact Us Delivery & returns Bedding glossary Subscribe.