Prosthetic foot device

A prosthetic foot device having a longitudinal direction and a transverse direction and comprising a base spring blade, an ankle spring blade and a heel spring blade, said base spring blade and said ankle spring blade being connected in a forefoot region of said prosthetic foot device, said base spring blade and said heel spring blade being connected in a heel region of said prosthetic foot device and said ankle spring blade and said heel spring blade being connected in an ankle region of said prosthetic foot device, said ankle spring blade being made from a composite material comprising glass fibres, wherein said ankle spring blade comprises a forward section, a medial section and a rear section in said longitudinal direction of said prosthetic foot device, said forward section having a first thickness, said medial section having a second thickness and said rear section having a third thickness, wherein said first thickness is smaller than said second thickness and smaller than said third thickness and wherein said second thickness is smaller than said third thickness said ankle spring blade being divided into said forward section, said medial section and said rear section along dividing lines extending across said ankle spring blade from a first side edge to a second side edge of said ankle spring blade and wherein a change in thickness between said sections of said ankle spring blade takes place abruptly at said dividing lines.