Many mattresses contain chemical flame retardants, and outgas toxic chemicals including formaldehyde.
If you have young children, limit their exposure to these chemicals by isolating mattresses in barrier covers made of natural materials. Or consider buying a mattress topper made with all-natural or organic cotton or wool, to separate you from the chemicals in the mattress.
Natural mattresses are often more costly than conventional mattresses. They are made with materials including cotton, wool, and natural latex rubber. Wool is a natural flame retardant. Mattresses made with a core of latex rubber can last much longer than conventional mattresses, offsetting the high cost.
See if a retailer in your area sells natural mattresses. Compare prices from online retailers. Don't forget to account for shipping costs, which can be high.
