The invention relates to an umbrella for protecting dignitaries (1), including: a pole (2); a slider (4) slidably mounted on the pole; a cut-resistant canopy (604); first ribs (603) supporting the cut-resistant canopy; second ribs (602) attached to the slider (4) and to the first ribs (603), the second ribs (602) being configured to extend or retract the cut-resistant canopy (604) when the slider slides along the pole, the slider including a unitary base in which grooves are provided, said grooves accommodating an end of the second ribs (602) that is pivotably mounted via pins (601), each of said pins extending perpendicularly to the axis of a respective second rib.
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