A batten is a thin, flexible strip of plastic or wood inserted into a sail. These strips help maintain the desired aerodynamic curve of the sailcloth in the wind. They support the back edge of the sail to prevent it from flapping or folding. A sailmaker slides a batten into a long pocket to stiffen the large mainsail. This extra support allows the sail to have a larger surface area for speed. Battens also help the sail hold its shape as it gets older and softer. Some boats use full-length battens that reach all the way across the entire sail.
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