THE FASTEST CALF SLEEVES – RECORD-BREAKING, WATT-SAVING, TRACK & TRI PROVEN Welcome to the new standard in cycling and triathlon performance: the HUUB 3:Sixteen Aero Calf Sleeve™. Developed and tested at Silverstone Sports Engineering Hub with champions like Dan Bigham, Alex Dowsett, and Joe Skipper for the legendary Sub7/Sub8 challenge, these calf sleeves leverage patented Aero-Bridge technology for a staggering up to 12 watt saving—the highest £/Watt gain in the sport. Smooth stretch fabric tensioned over ribbed support ridges suspends the surface and disrupts airflow, reducing drag and multiplying the time/energy gain. Designed for full-race use—including triathlons, TTs, and track—the Black/White 3:Sixteen pair gives you the edge the world’s best used to set records. Key Benefits: * Up to 12 Watts saved: Verified by world-class engineers and athletes * Patented Aero-Bridge Technology: Stretch fabric floats over ribbed support for airflow disruption and drag reduction * Dan Bigham & Sub7/Sub8 Team designed: Silverstone and Derby Velodrome tested * Precisely patterned for maximum aero savings * **Wear under wetsuit, through bike and run—tri-legal, non-UCI * TT & Track proven by record-breaking pros * S/M 30–40cm, L/XL 40–50cm—measure calf at widest point * Pack includes 1 left & 1 right sleeve (pair) * Country of Origin: China Size Guide Size Calf Circumference (cm) S/M 30–40 L/XL 40–50