Quick answer: The DUI Yukon II is a men's trilaminate drysuit for cold-water diving, listed in X-Large, X-Large Short and XX-Large. It has built-in suspenders, an Apeks inflator and relief valve, and a big cargo pocket.
A drysuit is the one piece of exposure protection where room is a feature: you need space for warm undergarments without the suit fighting you on every kick. The Yukon II's trilaminate shell doesn't compress at depth the way neoprene does, and the built-in suspenders take weight off your shoulders and hold the suit where it belongs. With XX-Large and an X-Large Short in the lineup, you can size for your chest and your height separately.
Measure while wearing the undergarments you plan to dive in, then compare against DUI's size chart. Take a drysuit course before your first dive in one. New to drysuits? Read Drysuit Wetsuit Comparison: Which Fits Your Dive? and our Dive Suit Layering Guide. More options: Extended-Size Wetsuits, Drysuits & Dive Apparel.