Run Fast

Sale price$28.00

Size chart






US 4-5.5 6.5-8.5 8.5-10 11-12.5
UK 3-5 6-8 8-9.5 10.5-12

Free EU shipping on orders over €150 (Italy over €75)
Shipping costs from €7, depending on country. Shipping time approximately 3-6 days.

Free Switzerland Shipping on orders over CHF150. Shipping time approximately 4-5 days

Free US shipping on orders over $200. Shipping time approximately 4-6 days


Developing the ultimate functional sportswear is not enough for us. Our goal is not only to provide you with the best gear in the high performance sports world, but also to ensure that your investment meets all your needs, requirements and expectations while performing at its best. We offer a two-year X-Bionic warranty on our revolutionary products.

Most Important Information

  • STRONGER: LAMBERTZ-NICHOLSON ACHILLES TENDON PROTECTOR 4.0. The Achilles tendon lies in the opening of the cushion and is thus protected from pressure and friction.

  • ASYMMETRIC O-RING BANDAGE. Stabilises tendons, muscles and joints in the ankle area without restricting movement.

  • AIR-CONDITIONING CHANNEL® 4.0. Air-conducting 3D structures and high-tech special yarn promote intensive ventilation of the feet.

  • 100% PURE SWISS ENGINEERED. Made in Italy. 700+ international awards and test wins, 800+ patent registrations for the products with the "X".


Take the intelligent shortcut to the future of running with the X-SOCKS® RUN FAST 4.0! Thanks to patented technologies, you can effortlessly reach your goal.

This special sock with barefoot climate benefits from the latest innovations in X-SOCKS® technology and offers you incomparable wearing comfort. More support, secure protection and continuous thermoregulation promote your performance and endurance. Your foot gets a firm hold in the anatomically shaped footbed and the ASYMMETRIC O-RING BANDAGE stabilizes your ankle joint. Protectors keep the toes, heel and ankle from being injured by pressure and friction.

The optimized Air-Conditioning Channel® 4.0 delivers fresh air into the shoe every step of the way, stopping moisture and reducing the risk of blistering. The newly designed Lambertz-Nicholson Achilles Tendon Protector 4.0 protects the sensitive area above the heel. Reinforced, two-part padded zones absorb pressure, friction and shocks even more effectively.

Albedo® 360° Reflective Technology increases safety in the dark.


Polyamide (80%) Polypropylene (17%) Elastane (3%)

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