Foamex 8″ Eco-Friendly Memory Foam Mattress
The Foamex 8" eco-friendly mattress has a 3" memory foam layer supported by 5" of polyurethane base foam. The density is not listed, but is somewhere in the range of 2-3 pounds depending on the size of the mattress. It has an open cell structure which helps with air circulation, and was produced with plant based ingredients instead of petroleum. It's also considered eco-friendly because no emissions were released when manufactured. Available sizes include king, queen, full, and twin. 
Dynasty Mattress 10-Inch Twin XL Deluxe Memory Foam Mattress
The 10-inch Deluxe mattress has a 5.3 pound density, 3" layer of memory foam supported by a 7" polyurethane base foam. Also included is a four-way zipper cover that can be removed and washed. According to their website, all of Dynasty mattresses have an ILD rating of 20, which means that it takes 20 pounds of force to make a 1" indentation. The mattress will arrive rolled up wrapped in plastic. It's backed by a 20-year warranty. Lucid by LinenSpa 10 Memory Foam Firm Viscoelastic Mattress
The Lucid 10" mattress has a 2.5-inch 3-pound density memory foam layer supported by a 7.5" polyurethane foam base. It utilizes open cell technology, which is designed to increase air flow throughout the mattress. The mattress is resistant to bacteria, mold, dust mites, and allergens. The velour cover can be taken off and washed. Sizes included full, cal king, king, queen, and twin. It's manufactured in China, and is backed by a 20-year warranty.
Dynasty Mattress Queen Therapeutic Luxury 12-Inch Memory Foam Mattress
The Therapeutic Luxury Mattress has a 5-inch, 5-pound density memory foam layer and a 7-inch high resilience polyurethane foam base. The zipper is made out of 100% cotton and zips 4-ways for easy removal. Dynasty mattress sells mattresses that are made in the USA and China; this one is manufactured in China. Dimensions: H 12" x W 60" x L 80"; 90 pounds. The mattress is backed by a 20 year warranty and a 120 day trial. SilverRest Full Deluxe 10″ Memory Foam Mattress
The SilverRest Full Deluxe is sold on Amazon.com by Dynasty Mattress. It has a 3-inch viscoelastic memory foam layer supported by a 7-inch polyurethane base foam. The density is 5.3 pounds, which places it in the highest class. Included is a cover made of 100% cotton with the feel of velour. It zips 4-ways and can be removed for cleaning. It's backed by a 20 year warranty.
Sarah Peyton Convection Cooled 8-inch Memory Foam Mattress
The Sarah Peyton 8-inch memory foam mattress consists of three layers. On top is a 2-inch 4-pound memory foam layer that is convection cooled for air circulation. The middle is a 3-inch core foam layer that features air flow channels designed to keep the mattress cool. The 3-inch high density base is designed to reduce pressure points and support. The mattress meets all flammability requirements. The velour cover can be removed for machine wash.
Spa Sensations 8-inch Memory Foam Mattress
The Spa Sensations 8-inch memory foam mattress contains 3 layers. The top layer is 2" of memory foam, the middle layer is 2" of soft foam, and the base is 4" of high density polyurethane. The density of the top layer of memory foam is 3 pounds. The cover is made out of a soft terry cloth. The level of firmness is that of a firm cushion. Spa Sensations uses a special memory foam called BioFoam, which contains a blend of natural seed oil and ingredients to make it more durable. The mattress is backed by a 5-year warranty.
SilverRest Sleep Shop Queen Deluxe 10″ Memory Foam Mattress
The Queen Deluxe 10" Mattress has a 3" memory foam layer and a 7" polyurethane base foam. The density is 5.3 pounds. The memory foam is 100% visco-elastic, meaning that it softens in warm conditions, and gets firm in cold conditions. The 4-way cotton zipper cover can be taken off and cleaned. It's backed by a 20 year warranty. Foamex 12-Inch Ultra-Luxe Memory Foam Mattress
The Foamex (now FXI) has been around for 40 years. They have a reputation for being innovators in the foam industry. The Ultra-Luxe mattress features a 3" Aerus premium memory foam comfort layer on top of a 9-inch IntelliForm base layer. The Aerus foam has a density of 4 pounds, and is made up of ingredients taken from plants instead of petroleum. Also featured is enhanced open cell technology for greater airflow. The Rayon cover is made out of bamboo fiber for a softer, cooler feel.
Memory Foam Solutions 10 Inch Memory Foam Mattress
The Memory Foam Solutions 10-inch mattress features 3-inches of 4-pound density foam and 7-inches of base foam. It's manufactured in the United States and received PURGreen certification. This means that it met the CSPC and EPA standards for safety and contains no harmful chemicals. The processes implemented during the manufacturing process are very environmentally friendly. Because it's visco-elastic, it will contour to your body and reduce pressure points. The mattress is available in all sizes.