Heel Cup System, Red -- Fits: Vertigo Corsa and Vertigo Boots

Adjustable Calf System, Black -- Works with: Vertigo Corsa and Vertigo Boots

Upper Ankle Support, Black -- Works with: Vertigo Corsa Boots. You get two parts per package as shown here (don't ask why you only get two black ones, but get four to a pack on the white ones. The vendor can't explain it to us either)

Lower Ankle Support with Vents, Black -- Works with: Vertigo Corsa Boots

Techno II Foot Bridge System -- Works with: Vertigo Corsa Boots

Techno II Calf Bridge System -- Works with: Vertigo Corsa and Vertigo Boots

Lower Ankle Support with Vents, White -- Works with: Vertigo Corsa Boots

Upper Ankle Support, White -- Works with: Vertigo Corsa Boots (four parts to a package as shown)

Adjustable Calf System, White -- Works with: Vertigo Corsa and Vertigo Boots

Heel Cup System, Grey