Its a small section inside the shoe that can expand up to 5 millimeters to prevent numbness. Without any extension system, the toes end up on top of each other and tend to get numb.
Shoes - Gear - Men
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Louis Garneau Tri X-Speed Xz Cycling Shoes
Louis Garneau Women's Tri X-Speed IV Cycling Shoe
The Pearl Izumi Tri Fly Pro Shoe is a premium podium-focused shoe designed for speed, comfort, and efficiency to make the most of race day. The upper is constructed from a combination of airy mesh and synthetic leather to maximize ventilation and support.
Pearl Izumi Tri Fly Pro Shoe White
Triathlon Bike Shoes: How to Find the Perfect Pair
Mens Triathlon Shoes Cycling Products - BikeTiresDirect
Louis Garneau Mens Tri X-Lite III Shoe [1487299-306-42]
Louis Garneau Tri X-Speed II SKU:8556325
Louis Garneau Tri X-Speed Xz Cycling Shoes – all3sports
Louis Garneau Platinum XZ Cycling Shoe - Men's - Men