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.
Absolutely. The cover is reinforced at all stress points and designed to stay secure at highway speeds. The strap-and-buckle system keeps everything tight during trailering.
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.
Every Sea Born 21 LX T-Top cover includes a 2-year manufacturer warranty covering defects in materials and workmanship under normal use.
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 9oz solution-dyed fabric is available in Navy, Black, and Charcoal. Premium Sunbrella acrylic offers an expanded color palette. All colors are solution-dyed for fade resistance.
Shipping is a $38 flat rate per cover to anywhere in the continental United States. Orders typically ship within 1-2 business days.
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 at highway trailering speeds — get from the driveway to the ramp and back with confidence. 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 a 2-year manufacturer warranty 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.
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