walmart air mattress return policy. When it comes to finding the most comfortable air mattress, it is tough to beat the quality and design of an Intex air mattress. Intex airbeds are highly rated and they are clinically proven to give you excellent support for your body. Features: Intexs tallest air mattress at 22 inches. Pump Included: Built-in pump inflates and deflates air bed for easy storage. Queen Size: 80" x 60" x 22" (may vary up to 2 inches depending on firmness).30-Day Return Policy.