I am greatly appreciative that Danner makes size 16B boots as this size is almost impossible to find. Further the quality is terrific, the fit is great, and I love my boots. However, as to the design there is one area that could be improved. The transition between the sole and the heel is not well "defined" as they say in the boot manufacturing industry. If you look at Danner's logging boots, just as an example, there is a well designed heel. These marine/temperate boots and other military boots by Danner have a sloping transition between the sole and heel. Why should you care? If you are on slick surfaces such as snow, mud, ice, or rain covered debris, the probability that you will fall is greatly increased. I discovered this while working outside in the snow, and finally had to purchase strap-on cleats in order to avoid constant falling. Well defined heels dig in and help prevent the slipping. If Danner made their logging boots in 16B I would have bought those, but alas, they don't.Update, November 2015: I should have paid attention to my own review above and declined to wear these boots despite the greatly increased number of falls I have experienced, even on dry fairly level ground. But finding 16B boots is very difficult and expensive. Well, I just fell again but this time broke my fibula where it joins the ankle. With as many falls as I have experienced, I believe the hard rubber sole with no defined heel was a key factor. While walking down a not too steep hill on dry grass and tree bark, my right foot slipped forward out from under me and I went down. This was far and away not the first time I have fallen because of the soles slipping on even dry ground. I am healthy, athletic, and a very active person so my physical condition was not a factor, and I fell very infrequently before owning Danner. I have also learned that the Vibram soles used on these and selected other Danner boots is of a relatively hard composition (read slippery). Vibram was invented by Vitale Bramini and there are many grades of this material. The softer grades provide much better slip resistance but trade that for reduced wear life. Many of the hiking boots available use Vibram but opt for a softer composition to provide traction. One can read hiking boot reviews to learn more about the importance of sole/heel hardness level and elasticity. I had thought about milling a defined heel into these boots to make them wearable, but the hard slippery soles just don't justify taking a chance on slipping again.For those in my unenviable position of wearing a 16B, I have found a boot with excellent slip resistance and defined heel: Red Wing boot #88608. Just pushing it along on the floor side by side with the Danner demonstrates a remarkable difference in slip resistance. For those who have easier sizes to obtain (15 and less) and would accept a hiking boot, check out Five Ten boots. The "Stealth Rubber" that the manufacturer has invented has absolutely incredible traction and is also used on their mountain climbing boots. Check out this video and drop your jaw: https://www.youtube.com/watch?v=tEmg1qszFPkI hope the manufacturer reads this and redesigns this boot. I have sent them information on their heel design but have received no indication they plan to change the design. If the boot was redesigned with slip resistant soles and a defined heel, it would be a great, high quality boot that I would buy again.