Long flights and hikes can wreak havoc on your circulation. Compression socks help increase blood flow, but most aren’t actually good for hiking. These are. “After an 18-hour travel day to Peru, I spent four days of hiking above 10,000 feet, but I had no swelling in my ankles or toes,” one tester says. “The socks wicked so well that I didn’t get blisters, and I never had to dry them at night.” For moisture management, the sock’s merino and nylon fibers are coated with tiny particles of volcanic ash, which expand to soak up sweat. Tradeoff: price.