Helly Hansen H/H Dry Stripe Boxer

Like most of the undies in this test, these boxer briefs are very effective at wicking moisture. But more so than any others, these prevent sweat buildup in the first place, thanks to the breezy weave of the 100-percent polypropylene fabric. “They never felt stifling, even when I was hiking in triple-digit temps,” says a California tester. Polypropylene is hydrophobic—it absorbs no moisture—giving these undies the fastest dry time in the test (from soaking to dry in 15 minutes). But the fabric proved prone to pilling in high-friction areas; we saw it after just a week of testing, but months later performance has not suffered. $35; 1.7 oz.; hellyhansen.com