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.
Louis Garneau Tri X-Speed XZ Cycling Shoes - Women's Salvia Purple 6.5
Louis Garneau
Women's Garneau Tri X-Speed XZ Shoe — Enduro Sport Inc
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Louis Garneau Women's Tri X-Speed XZ Triathlon Shoes — Playtri
Garneau Tri X-Speed XZ Shoes - Women's
Louis Garneau Tri-X Speed Women's Triathlon Shoe - Size 37
Louis Garneau Tri-X Speed Women's Triathlon Shoe - Size 37
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Louis Garneau Women's Tri X-Speed XZ Triathlon Shoes — Playtri
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