The term FOIL FEATURES can be solved by the five-letter word HILTS. This is an acronym for the four features of a foil: flexibility, opposition, inertia, and leverage. Flexibility refers to the ability of a foil to bend and flex in response to pressure. Opposition is the resistance of the foil to being bent or flexed. Inertia is the tendency of the foil to remain in its original shape. Leverage is the ability of the foil to use its shape to generate power.