I've seen the ads. My thoughts, for what they're worth: these things seem like overpriced felt-soled slippers to me. If you wear them over your heavy boots, you still are going to make a lot of noise for the reasons MJB mentions: inflexible soles and no feedback from the debris on the ground. You are going to snap everything you step on. Heavy socks are quiet and work great for me as long as I'm not on thorns or cactus.