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The CDI Mainsail Reefing MR4/6 is designed to fit medium to large size sailboats, with an optimal range up to 40ft. Much like the Flexible Furlers for jibs, the Mainsail Reefing System allows flexibility in the size of your mainsail when reefing, so you can adjust for all wind and sea conditions.

The following MR4/6 manual specifications will help you ascertain if this furler will fit your boat.

Sailboats up to 40′ long

Mainsail luffs up to 39′

Mainsails with up to 400 Sq Ft

Measure your boat using the above information to determine if the MR4/6 will fit your specific boat.


Click here to learn more about installing your new CDI Furling System!

The MR4/6 will fit:


  • Sailboats up to 40′ long.
  • Mainsail luffs up to 39′.
  • Mainsails with up to 400 Sq Ft area.