Simmons Curv 10 Inch Gel Memory Foam Mattress Simmons Curv 10" Gel Memory Foam Mattress with Luxurious Woven Jacquard Cover. Manufactured with CertiPUR-US certified foam Second generation Gel Memory Foam in the sleep surface helps keep you cool for a more relaxing sleep. Three layer design supports and reduces motion transfer for extra comfort. Foam Mattress made in the USA, Cover made in China.