Anchor Band Waterbed Mattress Protector Pad Waterbed King (72x84 inch) Polyester Protects mattresses from stains (accidental spills, perspiration, bodily fluids) Available in common hardside waterbed sizes fits waterbed King (72x84 inch) Hypo-allergenic- Elastic corner straps provide a secure fit for all thick and thin mattresses A must for families with children and pets! Mattress protector goes on like a fitted sheet. 50% Cotton/50% Polyester Waterbed Cover Offers Breathable Year Round Comfort