Sea Born 21 LX Specifications
- Length Overall (LOA): 21’1"
- Beam: 8’6"
- Dry Weight: ~2,600 lbs
- Engine: Single outboard, max 200 HP
- Fuel Capacity: 68 gallons
- Draft: ~13"
- Hull Type: 18° deadrise, stepped hull, no-wood all-composite construction
Cover Features
- Fabric Options: 9oz solution-dyed marine fabric or premium Sunbrella acrylic
- Coverage Type: T-Top cover wraps hull below hardtop; hardtop remains exposed
- Construction: Reinforced stitching, hem cord at rubrail, adjustable tie-down straps
- Durability: Solution-dyed fabric (5-7 years); Sunbrella acrylic (8-10 years)
- Fit: Custom-fitted to 21’1" Sea Born 21 LX specifications
- Protection: UV-resistant, water-repellent, weatherproof
Additional information
Choose Your Cover Fabric
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
| Weight | 31 lbs |
|---|
Install
Please watch the video below for installation instructions!
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Frequently Asked Questions
The Sea Born 21 LX T-Top cover is available in 9oz solution-dyed marine fabric, 7oz economy fabric, or premium Sunbrella acrylic. The 9oz solution-dyed option offers the best balance of durability and value for protecting your 21 LX.
Yes. The cover is pattern-cut specifically for the 21 LX, with reinforced cutouts that wrap around each T-Top support leg for a precise fit while leaving the hardtop exposed for ventilation.
Installation takes under 5 minutes with no tools required. Simply drape the cover over the boat, align the T-Top cutouts with the support legs, and secure using the adjustable strap-and-buckle system. One person can handle it easily.
No — please remove the cover before towing your Sea Born 21 LX. Our covers are not designed to be trailered: towing with the cover on can cause severe damage to the cover and voids the warranty. The cover is designed for storage only — on a trailer, boat lift, dry stack, or jet dock — and comes off in minutes at the ramp.
Yes. The cover creates a complete barrier over the cockpit area, shielding your electronics, upholstery, leaning post, and all deck-mounted equipment from UV rays, rain, salt spray, bird droppings, and debris.
Your Sea Born 21 LX cover is backed by our manufacturer's warranty for the original purchaser. Materials and workmanship — stitching, straps, buckles, zippers, and other hardware — are covered for 1 year from the purchase date. Fabric is covered for 3 years on 7oz, 5 years on black or navy 9oz, and 6 years on Sunbrella. Covered defects are repaired or replaced after you contact us for a Return Merchandise Authorization (RMA) number. The warranty does not cover improper use, accident or negligence, unauthorized modifications, improper care, mold or mildew, incorrectly placed orders, theft or loss, or acts of God — and traveling with the cover on or using it in the water voids the warranty. See our Warranty page for full details.
The cover is water-resistant with a durable water repellent (DWR) finish that sheds rain and spray. It is intentionally breathable rather than fully waterproof to prevent moisture and mildew buildup underneath — keeping your 21 LX dry and ventilated.
Yes. This cover fits all standard production years of the Sea Born 21 LX equipped with a factory T-Top. If Sea Born has made significant hull or T-Top design changes to your specific model year, contact us to confirm fitment.
The Sea Born 21 LX cover is available in 9oz solution-dyed polyester in Navy or Black, 7oz polyester in Black, or premium Sunbrella acrylic in Marine Blue, Black, or Smoke. Choose your fabric and color in the order options above.
Shipping is a $30 flat rate per cover within the continental United States. Because every cover is custom-made to order, please allow 1–3 weeks for your Sea Born 21 LX cover to be made and shipped — you'll receive tracking information as soon as it leaves our facility.
⏱️ Current lead time: 1–3 weeks — every cover is custom-made for your boat.
Questions about fit? Call (561) 677-2628
Questions about fit? Call (561) 677-2628
Sea Born 21 LX T-Top Boat Cover — Versatile Center Console Protection
The Sea Born 21 LX measures 21’1″ with an 8’6″ beam, weighs approximately 2,600 pounds, and handles up to 200 HP with a generous 68-gallon fuel tank and 13″ draft. Composite Research, Inc. has manufactured Sea Born boats in Blackshear, Georgia since 1995, engineering the LX series as a versatile center console platform capable of shallow coastal runs and offshore fishing alike — all built with no-wood all-composite construction, an 18° deadrise, and a stepped hull design. A custom T-Top boat cover from Perfect Fit protects this capable crossover from the elements while the hardtop stays exposed overhead.
Tailored to the 21 LX’s Center Console Layout
This cover is pattern-cut to the 21 LX’s specific dimensions, wrapping around each T-Top support leg while accounting for the center console, leaning post with integrated rod holders, and the self-bailing cockpit with its yacht-finished diamond non-skid deck. The strap-and-buckle system installs in under five minutes by a single person, and the reinforced design holds tight while the boat is parked. Remove the cover before towing — it’s designed for storage, not highway travel. If you’re also considering protection for the Sea Born 21 LX center console configuration, that cover is pattern-cut to the same hull with a different coverage profile.
Protection That Matches Sea Born’s 10-Year Hull Warranty
Your Sea Born’s composite hull is warranted for a decade — your cover should hold up just as long. The 9oz solution-dyed marine fabric delivers 5-7 years of UV and weather resistance with water-repellent, mildew-resistant performance and double-stitched seams. Upgrade to premium Sunbrella acrylic for 8-10 years of protection. Every cover ships with our warranty (1 year on materials and workmanship, plus 3–6 years on the fabric) and adjustable tie-down straps with a hem cord that tucks along the rubrail. Owners of similar platforms like the Savannah 21 SS trust the same construction quality to keep their boats covered season after season.