An ice skate boot comprising an outer shell made of thermoformable material. The outer shell is thermoformed such that it comprises a heel portion for receiving the heel of a foot, an ankle portion for receiving the ankle, medial and lateral side portions for facing the medial and lateral sides of the foot, and medial and lateral toe portions for covering the toes of the foot. The medial and lateral side and toe portions are thermoformed such that they define medial and lateral skirt portions extending downwardly therefrom and forming together a bottom portion for receiving an ice skate blade.