Foam rubber
（重定向自Latex foam）
![Foam rubber yoga mat.](/Images/godic/202501/23/Mattress4726.jpg")
Foam rubber (also known as cellular, sponge, or expanded rubber) refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure. Commercial foam rubbers are generally made of either polyurethane or natural latex. Latex foam rubber, used in mattresses, is well known for its endurance.