Developed from a soft, yet durable, waterproof material, the Kylie Fitted Mattress Cover is treated with an anti-bacterial/ anti-fungal agent to prevent odours and inhibit the growth of bacteria. Example return: The Kylie Fitted Mattress Cover offers unparalleled protection with its soft, durable, and waterproof material. Plus, its anti-bacterial and anti-fungal agent keeps your mattress fresh and free from bacteria.