HD2™ Reinforcement When we set out to build the best waders available, we knew that durability was a top priority. That's why we used our rugged HD2™ fabric to reinforce the seat, thighs, knees, and shins of our waders. The HD2™ fabric is added to high-wear areas to prevent much of the wear and tear that comes with hardcore waterfowl hunting. Sitting on rough seats in blinds, leaning against trees or logs, bumping into underwater stumps and logs, and kneeling on hard ground are all basic things that waterfowlers do ever day, but your waders shouldn't have to pay the price. Our HD2™ fabric protects all of these critical areas of the waders and makes sure that they can stand up to the demands of your hunt.