the soft shackle is very simple, undo shackle and put through the reef ring, do it up and leave it for when reqd, its a good loop to assist pulling sail down as well, , i think i used the marlow 8mm , its nice to handle and very strong, with a good slippery feel, no chafe seen as yet, i also used one for top main sheet block onto s/s loop on the boom, certainly nicer than s/s shackle to s/s, gybes are a lot quieter and no creaking when boom swings at anchor