From what I've seen (and worn) of the Zone 3 stuff, it's pretty toasty AND pretty wind proof. If I was going to buy a pair of cold weather hiking or walking (or riding with shorts with chamois underneath or running at very cold temps) tights, I'd definitely try them. Tough choice. I like my PI shorts (and pretty much only wear PI and Zoot these days), but I definitely like the warmth of the SportHill stuff. I'm not sure about that pair, but the stuff I've seen isn't super water proof, if that's a factor. No chamois either, but then you can wear a comfy trusty pair of PIs underneath
