Cotton-nylon blends work quite well and are available in a variety of styles and prices, but the very top of the line is supplex, which I believe is 100% nylon. It is tough and durable, a quality that it shares with the blends, but most important, it is extremely quick drying, a very valuable characteristic. I have a couple of shirts and two pairs of pants which have been on many trips and have handled rocks, gnarly brush, and a wide variety of temperatures with great ease. They make good windshells, but can be opened to ventilate quite well, performing properly up to temperatures in the 90 degree plus range.<br><br>Here is a signifiicant point. When you are talking about any of these decent quality fabrics, it is important to consider the tailoring, fit, quality of construction, and features of the garment itself, rather than just the fabric. I like a supplex shirt that is roomy, both to ventilate in hot weather and easily accept layers underneath for cold. Same with the pants. You want garments that can perform as shells in wind and cold, yet ventilate in warm conditions. It can be critical that they dry quickly, and it always pleasant if they do so. Quality of construction will show up long after purchase when seams will either hold up under sustained use, or fail at a critical point.<br><br>I don't worry about UV deterioration in garments nearly as much as I do in climbing ropes, where it is an insignificant factor in normal use. I have a pair of supplex pants which has beenin constant use, around town as well as hiking, for seven years - no signs of UV at all. Remember lighter colors degrade in UV faster than darker tones.<br><br>Fortunately, there are quite a few decent items to choose from.