For rigs with no mainsail, there is also no boom. This saves the cost of the boom, and hardware and lines associated with the boom. More importantly, eliminating the boom is a matter of safety. The second leading cause of death on sailboats is the boom. Booms cause injuries and deaths directly and indirectly by knocking people overboard. Even when stationary, booms represent a hazard. According to a German study, "boom strikes were the most common cause of sailing injury overall". Another aspect of safety is in regards to the elimination of the lines and hardware to control the boom. With fewer lines and less hardware on the deck there are fewer items to trip over or trap fingers and hands.