It’s not so hard to make a camo that hides you at 15 yards. There are many. But what happens as you move further away? In the majority of cases, you quickly become a solid object. And the deer are 100 yards, and 60 and 40 yards from you before they are 15.
Sticks N Limbs colors, natural shaped limbs, and its use of Binocular Rivalry gives you a Blurred Image. Game animals have trouble organizing you into a human form, because to them you look just like some limbs.