If you take a walk around any boat show these days you will find a common element amongst a large number of new yachts being produced. You will find that half if not more of these boats now have In-mast furling. Instead of your traditional mainsail that raises and lowers onto the boom, there is a furling foil inside of the mast in which the mainsail can roll and store itself. This foil works in the same way that your Genoa would furl. These systems can be "plug and play" with sailors especially with people who are new to sailing when the thought of raising and lowering a mainsail can be somewhat daunting. However, like with anything with sailing, stuff can still go wrong especially when it is least convenient. With that being said, here are some tips for furling, unfurling, and storing for long periods with In mast furling sails.