Like many, I too have used AeroSTich Darien stuff which is great product. I took a leap a year or so ago and went with KLIM Lattitide jacket. STich has good venting, KLIM has better venting, as I have worn this up to 100 degree heat. I have gone to 104 with the Darien and as stated, just didn't have as much air flow as the KLIM. Same is for pants. The KLIM OVERLAND pant with the diagonal across the thigh zipper catches air and provides great movement of air. The Darien LIght doesn't do this.
The STich stuff doesn't have any liner at all on the inside, which I prefer over the KLIM. The KLIM has only a thin mesh lining to go against the skin so you are not sticking to the outer shell when sweating.
I think the service is better with STich than KLIM, and STich made in USA.
Oh, I have two pair of Darien pants for sale size XXL, one is the Lite and is Tan, the other is Gray and is the Original Darien pant. I would let each one go for $250. I am selling because I shrunk two pant sizes.
I know, why go towards either of these two? Well, you wear this stuff, you pack less. You only need to pack very light and work with layers under this stuff. No need to fuss with rain gear putting on/taking off and repeating. Take advantage of nylon type packable clothing as in pants, shorts, wicking shirts. They dry over night with a hand wash in sink or stream. Cottin jeans are heavy and take up alot more space. Wear one pair, pack one set, rotate. Take what you want, but only what you need, there is a difference in this. You will find you won't use half the stuff you think you need to take.
Jeff