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.
Fizik Tempo Overcurve R4 Cycling Shoes – all3sports
Pearl Izumi Women's Tri Fly Select V6 Shoe
Garneau Tri X-Speed XZ Shoes - Fitworks Moncton
Louis Garneau Tri X-Speed Xz Cycling Shoes - Podium Multisport
The Women's Tri Fly SELECT v6 delivers a podium-worthy performance and the barefoot comfort of a Seamless Upper make this an exceptional all-around triathlon bike shoe.
Pearl Izumi Tri Fly Select V6 - Women's - White/Shadow Grey - 37
Cycling Shoes - Mr. C's Cycles
The Louis Garneau Tri X-Lite II Triathlon bike shoe is a high-performance triathlon shoe designed to take you from the first to the second transition
Louis Garneau Tri X-Lite II Triathlon Bike Shoe - 45.5 / Black/Yellow
Louis Garneau Cycling Cycling Shoes for Men for sale
Shoes - Gear - Men
Louis Garneau Mens Tri X-Speed XZ Shoes
Fizik Tempo Overcurve R4 Cycling Shoes – all3sports
Louis Garneau Mens Tri X-Speed XZ Shoes [1487333-020-43]
Louis Garneau Mens Tri X-Speed XZ Shoes
Louis Garneau Mens Tri X-Lite III Shoe [1487299-306-46]