These parts are lightweight 100% polyester. Like all lightweight polyester fabric, it can be a bit clingy when you put it on. I wear these when I want to be cool and dry (polyester is far superior to cotton for staying dry when you sweat), but also need protection from the sun. I ordered size 32W X 34L. As you can tell from my order, I am tall and slim. They are a very good fit for my frame. Normally I wear 34W X 34L, but Under Armor waist size is significantly different than every other brand. Because of this, do not buy your first pair of Under Armour online. Do what I did; go to a brick & mortar store, try them on, and buy them there. You really want to own a pair first before you try to buy them online.I bought these pants for my husband who is not exactly an easy shopper...We're traveling to Patagonia and he really needed some fresh, soft and water repellent tracking pants. Taking advantage of the Prime Wardrobe feature (which by the way I LOVE!) I ordered several brands and colors TWICE! Which means he tried at least 14 pants before I'd see a smile on his face, and THESE ones made the miracle! He loves them so much that he started wearing them almost daily...two weeks before our trip! I saw him so happy that I ordered one more in a different color.I absolutely love these Under Armour pants. They are super light weight and can be worn when it’s really hot outside and they wick sweat away so they don’t stick to you like most pants. I wouldn’t recommend wearing them when it’s really cold out because they’re really thin. I work in the heat and these pants are a godsendGreat pants and a very good price! Comfortable and adaptable to any situation...I wear them on the golf course and can ‘dress them up’ and wear them to work too. Most comfortable pants I’ve ever owned!These fit nice, the fabric gives and they look dressy enough to wear for work/casual.They do swish a bit when you walk so you might not sneak up on anyone. I bought several colorsI wished I had ordered another pair!! I like these pants so much I did ordered another pair! I had one pair made into long shorts! They do everything they advertise!!!THE BEST pants. Worth the money!!! True to size! It’s a nice shade of a grayish clay.pVery comfortable pants and well designed for the challenges of fly fishing a streamHands down some of the most versatile and comfortable pants out there. Great fit, quick drying... more colour choices would be better, but zero complaints