I discovered this product-line through trial and error. I was preparing for a deployment in 2007. I was in the middle of the desert at White Sands Missile Range and there was very limited shelter from the sun. I was having a terrible time and the medics offered several different brands to try. I wound up going through over 20 different kinds and even had contractors that were working with us bring back some others from stores in town. Eventually I found this one and it did the trick. Other brands left a white residue, left patches exposed, left me oily and sticky and worst of all just didn't work. Some even seemed to trap the heat in on top of the other discomforts. So as you can see I'm totally convinced. That was 2007 and I've been using and recommending this product line ever since. Kuwait, Iraq, Afghanistan, South America and the Caribbean. I use and recommend this to all my family, friends and soldiers. Thanks for developing this product line.