I have been RIGOROUSLY testing my Saxx underwear this summer in the most challenging of conditions. Happy to report that they've held up great.
My primary two pairs have been the Volt and the Kinetic. In particular I've been wearing the Kinetic for most of my outdoor pursuits this summer. This summer I've logged long days hiking, backpacking, and trail running, as well as days on the mountain bike, and everyday use. I find myself reaching for the Kinetic on more days than not.
The Kinetic is a bit more performance-oriented than previous Saxx designs, and it shows. They're not quite true compression shorts, but have great moisture control and enough compression to feel much more performance driven.
As with all of Saxx briefs, it features the ballpark pouch, keeping your nether regions nicely cradled and supported. It's hard to overstate the difference this makes from traditional briefs. I'm not sure I'll ever be able to go back to a pair without the pouch.
The Kinetic is a snug, comfortable fit. Be sure to check sizing though -- these run a bit large. A wide waistband prevents movement, and I haven't had any issues with them riding up my legs, even during activities like biking. The four-way-stretch blend of 90 percent nylon and 10 percent spandex is comfortable against the skin, and dries well.
Trust me, they've jumped in enough alpine lakes halfway through a long day for me to know.
At $37, many will balk at paying so much for a pair of underwear. However, you're definitely paying a premium for a premium pair of briefs. They've become my primary pair for outdoor adventures, and it'll be hard to ever wear anything else.