THE FIT:I have done alot of research on Fjallraven and their products. I have purchased both the Keb Jacket as well as the trousers. I'm 5' 10 and 170lbs (normally wear a 31 waist with western jeans). I ordered the medium size jacket and it fits very well. I probably could have fit in small if I wanted a tighter sleeker fit but I wouldn't have any room for baselayers when the temps lower. (I wouldn't suggest getting a large Keb jacket unless you are at least 6' 180lbs.) The same can be said with the trousers. I ordered a size 48 and I have to wear a belt with them. A size 46 would probably have been a more perfect fit for my body type. Also the particular pair that came to me was a 48 LONG. These pants look great even if they are long because of the slim fit in the legs. I'm sticking with the 48 instead of trying to go to a normal 46 because I want to be able to put at least one baselayer underneath these pants. Ideally I would wear a tighter 46 for warmer temperatures and for an even more stylish fit. No one who looks at me would think my 48 doesn't fit. Thats how well tailored Fjallravens clothes are.THE MATERIAL:The Keb jacket and trousers are made of two main materials, a very stretchy polymide and a durable and rugged G-1000 material that Fjallraven has patented. When purchasing Fjallraven gear you must pay very close attention on which parts of their clothing are the greatly esteemed G-1000 material or some other material. This really makes a difference in durability and resistance to the elements. As for the Keb trousers, its one of their trousers that have the least amount of G-1000 material mainly due to versatility being the core of the design. But this doesn't mean the trousers are not durable because the G-1000 material is placed in all the areas that receive more wear. But the polymide on both the pants and jacket are more vulnerable to rough wearing, wind, and moisture than its G-1000 counterpart. After wearing this system in the wind and also the pouring down rain I would say that the polymide areas absorb water quickly. As for the wind, it blocks much more than a fleece but a little less than a softshell jacket would. With the exception of the hood being unusually water resistant, the G-1000 material absorbs rain water as well but it much more wind resistant than the polymide. I do no know how resistant the system is to snow. Although I was suprised at the water absorption I was experiencing it was probably a greater surprise at how fast this system dried out. These issues may seem bad but its qualities like these that make this system viable in hotter seasons as well.ENVIRONMENTAL APPLICATION:Considering the purpose of the Keb design, I am convinced that it performs the best in trekking in dry, open, non-heavy brush environments ranging from 89F - 24F with a thin wool or polyester baselayer for the colder temps. The Keb setup absorbs rainwater fast despite it being advertised as water resistant, however because of its primary synthetic make-up it drys very fast as well.CONCLUSION:I love the quality of Fjallraven's gear so much that I'm buying many more of their pieces. They make different pieces for different uses and enviroments but if you're looking for one general bugout outerlayer the Keb system is one of the most stylish, adaptable, durable, and well-rounded clothing systems on the market today.