I'm 6'4, 170, large-tall size fits great. Inseam has plenty of room to spare, adjustable waist helps give them a perfect fit.
Breathe well in mid 80s and humid, kept me warm through some light rain and seemed to repel a light even though they are not strictly waterproof.
I do wish they had a zipper at the waist to connect with a jacket.
I bought these pants on Motorcycle Superstore because their stock and delivery-service positions. (The other retailers came up short on stock or delivery options.) I needed pants for a last minute group DS ride, like yesterday, and MS had the inventory and delivery options to meet my unreasonable needs.
Now for a comment on the sizing: awesome. I used the sizing tool on Klim's site to determine the best fit. It was spot on. For reference: I wear a size 34/32 Levis 501 and the size 34 Klim pants fit like a glove (err, pair of comfortable jeans).
So, sizing and availability aside, what about the pants? They're good. They perform as well as you would expect from a non-bargain pair of riding pants. They're as cool (breathable) as I could imagine DS/dirt pants could/should be, and they accommodate protection.
I've ridden in jeans and other (relatively) cheap DS/dirt pants (O'Neal brand recently purchased at a local store). The difference is comfort (think torrents of sweat in the afternoon sun) and protection (option to add armor).
Choose these Klim pants for the option of avoiding heat related discomfort (no laughing matter after 2--3 crashes in the dirt), and the option of avoiding pain and long lasting injury (add armor or face the consequences).
I hope the previous reviewer is wrong about upsetting the protection rating because I had to trim it, too. In fact, I will guess that almost everyone that buys this will have to trim it unless there is a standard size and shape that I don't know about. It trims easily. It is flexible, so it doesn't restrivt too much. It is heavy, but it gives me a certain amount of comfort knowing it is there instead of the flimsy crap that comes in the jacket.