The Mainsail is your yacht's driving sail. For cruising boats in particular, the mainsail is an important sail, being one of the hardest working of the complete inventory. You'll find features in a LEE SAIL that are specifically included to extend its life: reinforced batten pockets; fiberglass battens; leech line; tack and clew with leather chafe guards; sail numbers and class insignia; tell tales; leather encased, hand-sewn aluminum internal headboard and triple stitched with 6-points zigzag seams when required; stainless steel, heavy duty cringles; reinforced stress points.