Sea Born 21 FX Bay Sport Specifications
- Length Overall (LOA): 20’5"
- Beam: 97-98"
- Dry Weight: ~1,850 lbs
- Engine: Single outboard, max 150 HP
- Fuel Capacity: 45 gallons
- Draft: ~12-13"
- Hull Type: 17° 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 20’5" Sea Born 21 FX Bay Sport 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 FX Bay Sport 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 FX Bay Sport.
Yes. The cover is pattern-cut specifically for the 21 FX Bay Sport, 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 FX Bay Sport 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 FX Bay Sport dry and ventilated.
Yes. This cover fits all standard production years of the Sea Born 21 FX Bay Sport 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.
⏱️ 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 FX Bay Sport T-Top Boat Cover — Stepped-Hull Bay Boat Protection
The Sea Born 21 FX Bay Sport measures 20’5″ with a 97″ beam, weighs approximately 1,850 pounds, and runs a single outboard up to 150 HP with a 45-gallon fuel tank and 12″ draft. Built by Composite Research, Inc. in their 190,000-square-foot Blackshear, Georgia facility since 1995, Sea Born engineered the FX series with a performance-improving stepped hull and no-wood all-composite construction backed by a 10-year limited hull warranty. A Perfect Fit Boat Covers custom T-Top cover protects every inch of this versatile bay boat from sun, rain, and salt air while the hardtop remains exposed for ventilation.
Tailored to the 21 FX Bay Sport’s Tournament-Ready Deck
This cover is pattern-cut specifically for the 21 FX Bay Sport’s layout, wrapping precisely around the T-Top support legs while accounting for the center console, leaning post, and tournament-style deck with its dedicated casting platforms and integrated rod holders. The strap-and-buckle system lets a single person install the cover in under five minutes, and reinforced construction means you can trailer at highway speed with the cover secured — perfect for launching at shallow ramps with the FX’s 12″ draft. Whether you’re upgrading to the Sea Born 21 LX or keeping your Bay Sport rigged for inshore action, this cover keeps your investment protected between trips.
Protection That Matches Sea Born’s Composite Quality
Sea Born’s no-wood composite construction deserves a cover built to the same standard. Choose from 9oz solution-dyed marine fabric rated for 5-7 years of UV and weather resistance, or upgrade to premium Sunbrella acrylic for 8-10 years of protection. Both options are water-repellent, mildew-resistant, and feature double-stitched seams with reinforced stress points. Every cover includes a 2-year manufacturer warranty and ships with a hem cord that tucks neatly along the rubrail for a secure, custom fit — the same attention to detail you’ll find on covers for the Pathfinder 2200 Tournament Edition and other premium bay boats in the lineup.
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