X-Bionic Run Perform OTC Compression Socks

These socks feel snug and supportive around your calf, and supple and airy on your foot. The compression is targeted at the areas where your muscles move the most, so your legs feel more stable. There is extra cushioning around your heel, Achilles tendon, and toes, and the ventilation channels wick away sweat.

They perform best over long distances where your legs take a lot of abuse. Think of an ultra in the Ardennes, a long trail run with many descents, or a tough endurance run on asphalt. It is precisely in the final hours, when your legs start to tire, that you notice the difference: your calves feel less jerky with every landing and your feet stay dry, reducing the risk of chafing and blisters. They also keep your foot firmly in the shoe on technical terrain.

If in doubt, consider your preference and the circumstances. Due to the compression, they fit very tightly and take a little more effort to put on. Choose your size based on your calf circumference, as too tight or too loose does not work well. In extreme heat, knee-high socks feel warmer than short socks.

In short: firm compression socks for long distances and tired legs.