Breathable Mattress Underlay,80 X 60 In Mattress Underlay Under Mattress Features: Three-Layer Breathable Design: Our breathable mattress underlay features a three-layer structure with dual mesh fiber surfaces and a 3D breathable middle layer. The outer mesh allows for rapid airflow, while the middle support layer helps with ventilation and moisture reduction. This RV mattress underlay keeps your mattress dry and hygienic, whether in an RV, boat, or camper. Large Size Customizable Fit: Measuring 78.7" x 60" x 0.2", this Ventilated RV under mattress is generously sized to accommodate various bed types. The mattress underlay under mattress pad can also be easily cut to fit queen, king, or twin-sized mattresses, giving you a perfect custom fit. Durable Heavy-Duty Construction: Made from high-quality polypropylene, this cuttable mattress underlay is 0.2 inches (5mm) thick, lightweight, and highly resilient. The ventilated mattress pad?s sturdy construction ensures long-lasting support and prevents sagging, making it a reliable addition to your RV or boat. Easy to Use Maintain: Simply place the RV under mattress support under your mattress to prevent moisture buildup. Whether on the road or at home, it?s easy to transport and use, ensuring a fresh and comfortable sleeping environment. Versatile Application: Designed to prevent dampness caused by temperature changes and humidity, this ventilated under mattress pad is ideal for RVs, campers, boats, and even bedrooms. Our RV mattress underlay can help extend your mattress's life while enhancing your comfort.