Where Strength Meets Wisdom. At ESS Universal, we’re known for having the sturdiest bunk beds around, and for implementing innovative features that better match our customers’ needs. So, consider this – our steel bunk beds are seam-welded and fully sealed to keep those pesky pests out for good – creating the most bed bug proof bunks in the industry. At ESS Universal, we think that everyone deserves a bed that’s durable and comfortable because strength comes from a good night’s rest. ESS is your complete source for Heavy Duty Adult Metal Bunk Beds [ rated at 500 lbs per platform ], Waterproof High-Density Mattresses [ polyurethane - satin-feel ] , and Accessories [ including our under bed storage locker ]. We offer a variety of styles to specifically meet your needs. Gorilla Strong. Bed Bug Smart.