Materials and build quality seem to be on par with the Keen reputation. Since these are hard plastic, I was worried that they would not be comfortable (the Sansa earphones have a foam cover) but to me they are very comfortable, even more comfortable than the foam-covered Sansas, perhaps because they are a little smaller. POSSIBLE CON: it is made out of plastic and the two parts snap together, so who knows how long it will last but, at this price, I dont mind ordering another if my people are rough with it. I was able to find a replacement screw in my garage, but can?t turn the wood around, as the mounting brackets were installed already. Also around ears is very comfortable, Ive worn other headsets where my ears will literally start sweating and I have to clean my ears like every 30 mins. They are really soft and warm and the light grey matches everything. I like the fact that it has a nice design and holds 6 bottles. I will be buying the next size up. vice grips). It fit perfect and it was vacuumed sealed also delivery time was early and packaged right.