These undies (both the bikini and hipkini styles) won over every female staffer. “They’re my favorite for done-in-a-day, high-output hikes because they really do breathe better than others I’ve tried,” one says. That’s thanks to the Sport Mesh fabric, which uses extra-smooth nylon yarn to help eliminate micro-pockets where moisture could get trapped and features a pointelle mesh with tiny holes that promote airflow. And an unusual construction method—large, folded fabric hems at the waistband and leg holes push the flat seams “inland” a bit—really elevates comfort. Ding: They ripen quickly.