Berkeley Ergonomics Cotton Mattress Protector Designed to improve your mattress durability while preserving the feel and performance of your mattress surface. Designed to work with your mattress Shrink-to-fit, machine washable (at high temps) mattress protector Natural, breathable protection for your mattress Enhanced support, comfort and nighttime breathing Soft cotton knit for maximum stretch Eliminates surface tension Tri-zone knit for optimum airflow Made with 100% organic cotton knit. Good for the environment and your health Fitted Design for a perfect fit - up to 14" mattress profile Simple fitted design will reduce surface tension, bunching, shifting and motion transfer for a deeper and more restorative sleep. The stretch cotton is certified chemically safe by Oeko-Tex Standard 100, level 1. It is made from the same soft 100% organic cotton used in the cover of Berkeley Ergonomics' mattresses and pillow tops.