Dock lines (mooring lines) keep your boat safely tied to the dock. A good dock line absorbs surge, resists UV damage, and doesn’t chafe through. We compared 3 brands in the 1/2″ × 20ft double-braided nylon class — the standard for 25-40 foot recreational boats.
Head-to-Head Comparison
| Feature | New England Ropes C2 | Samson XLS3 | SeaSense |
|---|---|---|---|
| Rating | ⭐ 4.8/5 | ⭐ 4.7/5 | ⭐ 4.3/5 |
| Construction | Double braid nylon | Double braid nylon | Double braid nylon |
| Break Strength | 10,400 lbs | 10,400 lbs | 8,200 lbs |
| Stretch | 15-25% | 15-25% | 15-20% |
| Eye Splice | Professional 12″ eye | Professional 12″ eye | Machine-sewn 10″ eye |
| UV Treatment | Excellent (marine-grade) | Excellent | Good |
| Chafe Resistance | Excellent | Very good | Fair |
| Price (1/2″ × 20ft) | $35–$50 | $30–$45 | $15–$22 |
| Origin | ?? USA (Fall River, MA) | ?? USA (Ferndale, WA) | ?? China |
| Colors | White, Gold, Black, Navy | White, Black, Blue | White, Blue |
Brand Reviews
New England Ropes C2 — Marina Standard
⭐ 4.8/5 | New England Ropes has been making line in Fall River, Massachusetts since 1967. Their C2 dock line is the most popular premium dock line in the US. The hand-spliced eye is a work of art, the nylon is supple yet strong, and the gold color has become iconic in marinas across New England.
Pros: • Best hand feel — soft and easy to handle • Professional hand-spliced eye • Excellent UV and abrasion resistance • American-made • Multiple color options
Cons: • Premium pricing • Gold color shows dirt
What boaters say: “I’ve had the same NER gold dock lines for 6 seasons. Still soft, still strong. You can tell they’re quality just by how they feel in your hand.” — Sailboat owner, Chesapeake Bay
Samson XLS3 — Professional’s Pick
⭐ 4.7/5 | Samson Rope (Ferndale, Washington) supplies lines to the US Navy, commercial shipping, and offshore oil. Their XLS3 dock line brings that same engineering to the recreational market. Slightly firmer than NER, but equally durable.
Pros: • Naval/commercial pedigree • Excellent strength-to-weight • Good value vs NER • American-made
Cons: • Slightly stiffer than NER • Fewer color options
SeaSense — Budget Option
⭐ 4.3/5 | Chinese-made dock lines at 50-60% of the premium brands’ price. The machine-sewn eye splice is adequate but not as strong or clean as a hand splice. Fine for trailer boats and seasonal use, but the UV resistance won’t hold up as well over multiple seasons.
Pros: • Most affordable • Good enough for seasonal/trailer boats • Easy to find at big-box marine stores
Cons: • Machine-sewn eye (weaker, less elegant) • Lower break strength • UV degradation after 2-3 seasons • Stiffer hand feel
Dock Line Sizing Guide
Rule of thumb: Use 1/8″ of line diameter for every 9 feet of boat length.
• 20-27ft boat → 3/8″ line
• 28-36ft boat → 1/2″ line
• 37-45ft boat → 5/8″ line
• 46-54ft boat → 3/4″ line
Length: Bow and stern lines should be at least 2/3 of boat length. Spring lines should equal boat length.
Recommendation
Year-round slip: New England Ropes C2 — the best hand feel and longest-lasting UV protection. Value pick: Samson XLS3 — commercial quality at a fair price. Trailer boat/seasonal: SeaSense — good enough for boats that spend most of their time out of the water.
Ratings from Amazon, West Marine, and cruising forums. CargoRigging.com is an independent directory.
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Frequently Asked Questions
What is the best dock line material for my boat?
Nylon double-braid is the gold standard for dock lines. Its 15-20% stretch absorbs surge loads from waves and wakes, protecting cleats and hardware. Three-strand nylon is more affordable and easier to splice but slightly less abrasion-resistant. For permanent mooring in rough conditions, consider polyester double-braid — it stretches less (8-12%) but resists UV degradation better than nylon. Avoid polypropylene dock lines; they degrade rapidly in sunlight.
What diameter dock line do I need?
Use 1/8 inch of line diameter per 9 feet of boat length as a starting point. A 27-foot boat needs 3/8-inch lines, a 36-foot boat needs 1/2-inch, and a 45-foot boat needs 5/8-inch. Round up for heavier boats, exposed slips, or areas with strong tidal currents. Bow and stern lines should be the calculated diameter; spring lines can be one size smaller since they handle less surge force. Always have at least one set of storm lines one size larger than your standard set.
How long should dock lines be?
Bow and stern lines should be 2/3 of the boat length. Forward and aft spring lines should equal the boat length. For breast lines (perpendicular to the dock), use lines equal to the beam width plus 3-4 feet for tidal range. Longer lines allow more scope for tidal changes and better shock absorption. In tidal areas, lines must be long enough to accommodate the full tidal range without going slack at low tide or pulling the boat under the dock at high tide.