My feet tend to sweat easily and although I love my leather Targhees, I know my feet would be wrecked after a week of warm weather hiking with leather uppers. They have the best overall noise cancelling, comfort, and sound quality. This whole experience actually made me do a fresh Windows 7 install, and the problem is still there. Its not a problem though as its easy to remove when you need to. There are two versions. 5-13 Little kid. The foam near the hinge has already started to fray, from the installation and couple of test folds Ive done. Wasn?t quite as sturdy as I had hoped, had to really crank down the screws to the point I was worried I would strip them out and it still wobbled just a bit, to the point that I didn?t feel comfortable scouldnt even put 1 leg inside these pants. the difference is fairly dramatic. My son loves these!