Jump boots (also known as paratrooper boots) are a type of combat boot typically associated with soldiers (called paratroopers) assigned to parachute units. Jump boots are fully laced from the instep to the top and give more support to the ankle whereas ordinary combat boots during World War Two were laced just above the ankle and had to be worn with leggings or puttees to prevent mud and dirt from entering the shoe. Although in modern times, nearly all combat boots are fully laced, modern jump boots are mainly worn as dress and parade boots. They are generally made of smooth leather with toe-caps and heel counters that accept a high polish or "spit-shine". They often have side zips for easy removal. Although not prohibited by regulation, jump boots should not be worn by soldiers who do not possess an Airborne qualification.