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All our sails come with our Calibrated Downhaul System.

The Calibrated Downhaul System takes the guesswork out of finding the correct downhaul. Here’s how it works: We rig your sail in the factory on the correct mast with a highly sensitive load cell that measures the downhaul tension. Once at the correct tension, we attach a gauge at the exact position that aligns with the bottom of the mast.
So, all you need to do is downhaul until the bottom of your mast lines up with our calibration gauge. The position of the calibration gauge is unique to each individual sail.