The Spinlock Mast Pro harness is made by Petzl, and is basically a rock climbing harness modified to meet the needs of a mast climber... with wider thigh straps, so that they don't cut the circulation off in your legs as quickly as a traditional rock climbing harness would.
Most rock climbing harnesses are NOT suitable for use as deck harnesses, as their attachment point is too low and if you were to fall in with it attached to a tether, it would tend to drag you through the water HEAD DOWN. A sailing safety harness, other than one used for climbing the mast, should have the attachment point about two inches above your sternum. This is for two major reasons. First, it will tend to drag you through the water HEAD UP. Second, the ribs below the sternum are floating ribs and nowhere near as strong at resisting the forces generated by the harness when you fall.
JGAddiss is thinking of the MastMate, which is essentially a very long etrier that attaches to a halyard and to the mast's sail slug slot.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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