49 CREW POSITION; LIFELINES
49.1 Competitors shall use no device designed to position their bodies outboard, other than hiking straps and stiffeners worn under the thighs.
49.2 When lifelines are required by the class rules
or the sailing instructions they shall be taut, and competitors shall not position
any part of their torsos outside them, except briefly to perform a necessary
task. On boats equipped with upper and lower lifelines of wire, a competitor
sitting on the deck facing outboard with his waist inside the lower lifeline
may have the upper part of his body outside the upper lifeline. If the class
rules do not specify the material or minimum diameter of lifelines, they shall
comply with the corresponding specifications in the ISAF Offshore Special Regulations
Note: The ISAF Offshore Special Regulations are available at the ISAF website.