Large king-size beds need protection from dust mites too. Our king-size encasements are designed to cover every inch of a king bed’s mattress and duvet with allergy-proof barriers. The king mattress encasement locks out dust mites and allergens across the entire mattress surface, keeping your bed clean despite its size. Pair it with a king duvet encasement for comprehensive dust mite defense for your bedding. Enjoy a luxurious night’s sleep in your king bed, confident that dust mite allergens are under control.