Abstract: A board for sliding on snow is provided and has nose, intermediate and tail portions. The nose and tail portions have a thickness that will not deform under the weight of a user. The intermediate portion has a thickness that it will elastically bend under the weight of a user. The board is shaped into an inverted arch and has a side plate mounted on each of the side edges to extend longitudinally thereof. Step-decks for the user's stance are located on the respective connections between the nose and intermediate portions and between the intermediate and tail portions with the step-decks being inclined downwardly toward the intermediate portion. The tail portion has at least one pin tail configuration and includes a fin-box embedded at the bottom of said pin tail. The fin-box includes a fin which is detachably mounted therewithin such that the fin will be released when a force is applied thereto that is stronger than a predetermined level.