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.
Triathlon Cycling Shoes in CANADA
Shoes - Gear - Women
Tri X-Lite III Triathlon Shoes
Zapatillas de ciclismo mujer, Zapatillas y cubrezapatillas, Ciclismo, Deportes - PicClick ES
LOUIS GARNEAU Jade - Women's road cycling shoes - Sports aux Puces VéloGare
Tri Shoes Competitive Cyclist
Louis Garneau Women's X-Lite III Triathlon Shoes — Playtri
Louis Garneau Womens Tri X-Speed XZ Shoes
Tri Shoes Competitive Cyclist