A sporting boot comprising a thermoformed outer shell having a heel portion for receiving the heel of a foot, an ankle portion for receiving the ankle and medial and lateral side portions for receiving the medial and lateral sides of the foot. At least one of the medial and lateral side portions comprises a skirt portion integrally formed with and extending therefrom, the skirt portion being folded inwardly to form a sole having an upper surface for facing the plantar surface of the foot.