The Dually Extend expands the sleeping area of the Dually by maximizing extra space with HEST&';s enhanced memory foam. The Extend easily attaches to HEST Dually models-Dually Extend 72 for the Dually Wide and Dually Extend 78 for the Dually Long or Queen-offering a larger mattress area suitable for slide-outs in campers, larger RTTs, and RVs. It can also be used alone on benches or other narrower spaces. SIZING GUIDE "I&';ve slept on at least 30 different camping pads over the years. I&';m not sure I&';ll ever sleep on another one." - Field & Stream The Dually Extend expands the sleeping area of the Dually by maximizing extra space with HEST&';s enhanced memory foam. The Extend easily attaches to HEST Dually models-Dually Extend 72 for the Dually Wide and Dually Extend 78 for the Dually Long or Queen-offering a larger mattress area suitable for slide-outs in campers, larger RTTs, and RVs. It fits perfectly in Tune Campers or Four Wheel Camper&';s Project M. The Dually Extend can also be used independently from the Dually, providing extra comfort for benches or other narrower spaces where HEST&';s enhanced memory foam is desired.