- Foam used to reduce camber (draft) of roller furling sail when partially furled.
- When sewn on luff in a crescent moon shape there will be more cloth rolled out of the middle than the ends to help flatten the reefed sail.
- Foam padding flattens sail when furled.
- Flatter sail reduces heeling and makes boat easier to steer.
- Easy to cut.
- Does not absorb water.
- Available only on full rolls
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