When we've got a long day of hiking in the summer heat ahead of us, we slip our feet into the Smartwool Hike Targeted Cushion Crew Sock. The lightweight design provides cushioning beneath our heel and the balls of our feet, allowing greater breathability for the rest of our feet so we stay cool on hot, dusty trails. The 4 Degree fit system dials in a high-performance fit, and the comfort welt ensures the socks stay put as we put them through the wringer. The Indestructawool technology increases durability, while body-mapped mesh zones minimize weight and allow stuffy air to escape.