It is an old model or a product that we can no longer order at the manufacturer.
The Trek Outdoor Low Cut from X-Socks is one of the top references in hiking socks. Developed for intensive hiking, the Trek Outdoor Low Cut is a highly technical sock that incorporates several technologies. The X-Cross® bandage, Achilles tendon protector, and toe protections help reduce the risk of foot injuries. A temperature regulation system called Air Conditioning Channel ensures that your foot stays dry. With each step, the Traverse AirFlow Channels located under the foot pump moisture and evacuate it to the outside of the shoe. Fresh air is continuously renewed to prevent sweat and discomfort. A zone on the instep creates a space for air to circulate freely, thus increasing comfort. Thermoregulation inside the shoe is optimized to keep the foot dry and protected from blisters. X-Socks develops its socks to eliminate the various pains that walking can cause to the feet, optimizing comfort. Quick-drying, odor-resistant, breathable, and very durable.
Very comfortable sock.. excellent service