- Bomb-proof durability extended up the heel and into the Achilles
- Re-engineered flex window for improved fit and flexibility
- Added durability underfoot extended into high-wear zones for lasting performance
- Ultra-Light: Our lightest sock for race day or anyone looking for a lighter-than-air feel from a tougher than hell sock.
- No-Show Height: The toughest sock you’ll never see. When your shoes are on this sock is gone.
- 56% Nylon, 38% CoolMax Polyester, 6% Lycra Spandex