Needed? Probably not. A preference to wear them......maybe. I've hunted many times without them and many with them. I prefer to wear them. CO is normally dry, but they do a great job of keeping all the stuff (pine needles, sticks, burrs, and whatever) out of my boots and off my pants. They also keep your lower pants dry, which then keeps most of your boot dry. They also protect your pants. I didn't wear mine last year one afternoon, and that was the day I slid into a blowdown with a broken off branch that ripped my pants. That wouldn't have happened with my gaiters on.