These active pants and shorts come in a technical, high-quality stretch nylon; they are nicely styled, with well thought out pocketing.
"Our Rock Guides are made of soft, stretch-woven nylon tough enough to withstand the sharp crystalline scrambling of Joshua Tree. They have the proven performance of our Guide line but a lighter fabric with 40-UPF sun protection, more contemporary styling and, this season, a more streamlined fit."
Read more at http://www.ukclimbing.com/gear/news.php?id=2776