Darn Tough's line of performance-oriented socks features four levels of padding that vary from light and streamlined to fully loaded. Each features a merino wool blend for warmth, durability, and the perfect amount of stretch. If you like to feel the terrain underfoot, choose the RFL Ultralight. For targeted padding that prevents “shin bang,” opt for the Padded Light or Padded Cushion. Or, go all out with the Function 5, which has five precisely located comfort pads designed to diminish pressure points, reduce heel lift, protect the top of the foot from second buckle pressure, and more.