Seaswirl Boats 18 Sierra Boat Covers

Save 10% Off Performance Aqua Shield!
Narrow Search
Model Year:
Engine Type:
Narrow Your Search
Semi-Custom Fit Boat Covers
Semi-Custom covers are made by boat style to fit a variety of models
Westland Semi-Custom Covers
Made in 3 Business Days or less
Free Vented Support Pole
Up To a 7 Year Warranty
Fits: Conventional V-Hull Runabout Boat 18' O/B O/B Motor Hood Not Included
Fits years: (All Years)
Fits Lengths: 17' 6" - 18' 5"
Max Beam: 102"
Available Fabrics
Price
Sharkskin
Sharkskin Plus
HydraMax
Sharkskin Supreme SD
$247.99
$262.99
$315.99
$322.99
Fits: Euro Cuddy Boat 19' I/O
Fits years: (1987 - 1990)
Fits Lengths: 18' 6" - 19' 5"
Max Beam: 102"
Available Fabrics
Price
Sharkskin
HydraMax
Sharkskin Plus
Sharkskin Supreme SD
$309.99
$370.99
$329.99
$385.99
Fits: Euro Style V-Hull Runabout Boat 18' I/O
Fits years: (1989 - 1990)
Fits Lengths: 17' 6" - 18' 5"
Max Beam: 102"
Available Fabrics
Price
Sharkskin
Sharkskin Plus
HydraMax
Sharkskin Supreme SD
$244.99
$258.99
$321.99
$327.99
ENDURACover Semi-Custom Covers
Made in 4 Business Days or less
Proudly made in the USA
Free Cover Straps Included
Fits: Euro-style V-Hull Runabout Boat 18' O/B
Fits years: (1983 - 1986)
Fits Lengths: 17' 7" - 18' 6"
Max Beam: 96"
Available Fabrics
Price
Safe Harbor
Performance Aqua Shield
Supreme Aqua Shield
$239.99
$228.99
$271.99
Fits: V-Hull, Low Profile Cuddy Cabin Boat 18' I/O
Fits years: (1987 - 1990)
Fits Lengths: 17' 7" - 18' 6"
Max Beam: 96"
Available Fabrics
Price
Safe Harbor
Performance Aqua Shield
Supreme Aqua Shield
$254.99
$243.99
$288.99
Fits: Euro-style V-Hull Runabout Boat 18' I/O
Fits years: (1989 - 1990)
Fits Lengths: 17' 7" - 18' 6"
Max Beam: 96"
Available Fabrics
Price
Safe Harbor
Performance Aqua Shield
Supreme Aqua Shield
In-Stock Special Available!
$239.99
$228.99
$271.99
$321.99
Taylor Made Semi-Custom Covers
Made in 5 Business Days or less
Free Shipping
Free Cover Straps Included
Fits: V-Hull Cuddy Cabin Boat 18' I/O
Fits years: (1988)
Fits Lengths: 17' 5" - 18' 4"
Max Beam: 93"
Available Fabrics
Price
Poly-Cotton
Hot Shot
$231.99
$308.99
Boat Cover Help Guide
Material: 100% polyester
Weight: 6 oz. polyester, 300 denier
Warranty: 3 year limited warranty
Silver
Material: 100% polyester
Weight: 6.5 oz. polyester, 450 denier
Warranty: 5 year limited warranty
Shark BlueArctic SilverSharkcoalWhiteForest GreenRoyal BlueBurgundyLinenBlackRed
Material: 100% polyester
Weight: 11.5 oz. solution-dyed polyester, 840 denier
Warranty: 7 year limited warranty
Tan
Material: 100% polyester
Weight: Solution-dyed polyester, 600 denier
Warranty: 7 year limited warranty
BlackSea Gull GrayCaribbean Blue
Material: 50% polyester, 50% cotton
Weight: 11 oz. marine duck canvas
Warranty: 3 year limited warranty
Haze Gray
Material: 100% polyester
Weight: 8 oz. natural plied polyester, 600 denier, 90 thread
Warranty: 5 year limited warranty
Haze GrayBeige
Material: 100% Polyester
Weight: 7 oz. solution-dyed Polyester, 600 denier
Warranty: 7 year warranty
Admiral NavyBlackCobalt BlueGreenMaroonRedStorm GrayTealYellowMist GrayKhaki
Ready-2-Ship & In-Stock Specials


Deep discount over standard Made-To-Order covers
In-Stock Specials are Ready-To-Ship from the warehouse.
Select "Choose Cover" to see fabric & color availability.
Material: 60% polyester, 40% Cotton
Weight: 10 oz. per square yard
Warranty: 2 year warranty
Gray
Material: Acrylic coated polyester
Weight: 6.25 oz. per square yard
Warranty: 5 year limited warranty
CranberryHunter GreenGrayNavyBlueTealBlack
Custom Covers vs. Semi-Custom Covers


Custom Boat Covers are patterned and tailored for the specific make, model, and year of the boat.


Semi-Custom Boat Covers are made by boat style to fit a variety of models.


Engine Type & Boat Covers:

Outboard (O/B) - Removable engine mounted to the transom of the boat.
Sterndrive or Inboard/Outdrive (I/O) - Permanent engine mounted on stern of boat with portion of engine (the outdrive) in the water.
Inboard (I/B) - Permanent engine mounted in the center or stern of boat with only the propeller shaft exposed to water. Inboards should use the I/O cover.
One moment please...
loading...
Boat Cover Specials
Free Shipping On All Boat & PWC Covers!
  • Hurry! Limited Time Offer.
  • Available in continental U.S.
  • UPS Ground shipping only.
Summer Sale-a-palooza
Why Buy From Us?
Largest collection of patterns anywhere. Largest collection of patterns anywhere.
Many colors and fabrics to choose from. Free fabric samples upon request. Many colors and fabrics to choose from. Free fabric samples upon request.
Multiple warranty options. Multiple warranty options.
Call us at 1-800-589-0599 Call us at 1-800-589-0599
Other Features:
  • Built to last.
  • Trailerable Options Available
  • Everyday low prices
  • Free shipping