Do Latex Mattresses Off-Gas? However, natural latex mattresses, like the ones offered by SleepSpa, are a different story. Natural latex is made from the sap of rubber trees and goes through a process that doesn’t involve harmful chemicals or synthetic fillers. As a result, natural latex mattresses are free from the VOCs that cause off-gassing. If there is any scent at all, it’s typically a mild, natural rubber smell that quickly fades — a far cry from the strong chemical odors emitted by synthetic mattresses. https://www.sleepspa.in/product-category/mattress/latex-mattress/