Furling Lines

By MAURIPRO Rigging Specialists · Updated March 2026

Furling lines are the backbone of any reliable sail furling system, enabling precise control over sail deployment and retrieval while withstanding the demanding marine environment. The performance of your furling system depends heavily on selecting lines with optimal low-stretch properties, superior abrasion resistance, and appropriate diameter for your specific furler configuration.

MAURIPRO carries premium furling lines from industry leaders Facnor, Selden, and Harken, alongside our own high-performance furling loops engineered for durability and reliability. Whether you need continuous furling lines for roller reefing systems or pre-assembled furling line and web combinations, our selection covers diameters from 5/16" to 1/2" to match your boat's requirements. Each product is designed to deliver consistent performance under load while resisting the UV exposure, salt corrosion, and mechanical wear that characterize marine applications.

How to Choose the Right Furling Lines

Diameter Selection Based on Furling System Requirements

The diameter of your furling line directly correlates to the torque requirements of your furling system and the size of your vessel. For boats up to 35 feet with headsail areas under 400 square feet, 5/16 inch (8.0 mm) lines like the Harken Furling Line Double-Braid provide adequate strength while maintaining flexibility for smooth operation through blocks and fairleads. Mid-size vessels between 35-45 feet typically require 3/8 inch (10.0 mm) diameter lines, which offer the optimal balance of strength and handling characteristics.

Larger cruising vessels over 45 feet with substantial sail areas demand 1/2 inch (12.0 mm) diameter furling lines such as the Selden Continuous Furling Line series. These heavier lines provide the necessary grip on furling drums and can withstand the increased loads generated by larger genoas and jibs. The additional diameter also reduces hand fatigue during manual furling operations and provides better purchase when using winches.

Consider your furling drum's groove specifications when selecting diameter, as mismatched line sizes can cause slippage or jamming. Most quality furling systems accommodate multiple line diameters, but optimal performance occurs when the line diameter matches 75-80% of the drum groove depth.

Material Construction and Load Characteristics

Low-stretch construction is paramount for furling line performance, as stretch introduces inconsistent tension that can lead to sail shape distortion and furling difficulties. Double-braided polyester lines, such as those offered by Harken and Facnor, feature a load-bearing core surrounded by a protective outer braid that resists abrasion from blocks, fairleads, and drum surfaces. This construction typically exhibits stretch characteristics under 3% at working loads.

High-modulus polyethylene blends provide superior low-stretch performance but require careful handling to prevent damage from heat generated by rapid line movement through blocks. These materials excel in racing applications where precise sail control is critical. For cruising applications, traditional double-braided polyester offers the best combination of durability, handling characteristics, and cost-effectiveness.

Continuous vs. Assembled Line Systems

Continuous furling lines create an endless loop system that eliminates the need for line splices or connections within the furling circuit. Selden Continuous Furling Lines are pre-measured and spliced to create seamless loops that distribute wear evenly around the entire line length. This design reduces failure points and provides consistent performance over extended periods.

Assembled systems, such as the Facnor Furling Line and Web Assembled products, incorporate webbing sections that engage with furling drum teeth for positive grip. These systems excel in applications requiring precise positioning and prevent slippage under high loads. The webbing sections also provide visual reference points for consistent furling positions, particularly valuable for roller-reefing applications where partial furling is common.

MAURIPRO Furling Loops offer pre-configured continuous systems in various lengths from 70 feet to 90 feet, accommodating different boat sizes and furling system configurations. These loops eliminate field splicing requirements and ensure consistent performance characteristics throughout the line length.

Length Requirements and System Compatibility

Proper furling line length depends on your boat's deck layout, furling system location, and cockpit configuration. Measure from the furling drum, through all turning blocks and fairleads, to the cockpit winch or cleat, then double this distance for continuous loop systems. Add 10-15% additional length to accommodate different furling positions and provide adequate tail length for secure cleating.

Most production boats require furling line lengths between 70-90 feet for continuous systems, with MAURIPRO offering standard lengths of 70, 80, and 90 feet to match common configurations. Custom lengths may be necessary for boats with unusual deck layouts or multiple turning blocks that extend the line run significantly.

Brand-Specific Performance Characteristics

Facnor furling lines incorporate their proprietary web assembly system that interfaces directly with Facnor furling drums, providing positive engagement that prevents slippage even under extreme loads. Their double-braid construction uses marine-grade polyester with enhanced UV resistance for extended service life in harsh marine environments.

Selden continuous lines feature heat-set construction that maintains consistent diameter and reduces stretch over time. Their splicing techniques create smooth joints that pass through blocks without snagging, while maintaining full line strength. Harken's double-braid construction emphasizes flexibility and smooth operation through their ball-bearing blocks and fairleads, with optimized core-to-cover ratios for maximum strength retention.

Brand Overview

Brand	Models in Stock	Price Range
Facnor	4 models	$200–$491
Selden	3 models	$164–$245
Harken	1 models	$197
MAURIPRO	6 models	$154–$189

Technical Decision Matrix

Compare key specifications across brands and models to find the right fit for your boat and sailing style.

Technical Decision Matrix

Brand	Series / Model	Price Range	Key Feature	Best For	Shop
Facnor	Furling Line and Web Assembled	$491	Marine-grade alloy	Cruising & Racing	View Models
Selden	Continuous Furling Line	$245	Marine-grade alloy	Cruising & Racing	View Models
Harken	Furling Line Double	$197	Marine-grade alloy	Cruising & Racing	View Models
MAURIPRO		$189	Marine-grade alloy	Cruising & Racing	View Models

Frequently Asked Questions

What diameter furling line should I choose for my boat?

The diameter depends on your boat size, furling system specifications, and expected loads. For smaller boats (under 35 feet), 5/16 inch (8.0 mm) lines like our Harken Furling Line Double-Braid work well. Mid-size boats typically use 3/8 inch (10.0 mm) diameter, available from Facnor, MAURIPRO, and Selden. Larger vessels often require 1/2 inch (12.0 mm) lines like the Selden Continuous Furling Line for adequate strength and grip. Always check your furling system manufacturer's recommendations for proper sizing.

What's the difference between continuous furling lines and pre-assembled furling loops?

Continuous furling lines like those from Selden come as straight rope that you cut to length and splice yourself, giving maximum flexibility for custom installations. Pre-assembled furling loops from Facnor and MAURIPRO come ready-to-install with professionally spliced ends at specific lengths (7-9 feet typically). Continuous lines offer more customization but require splicing skills, while pre-assembled loops provide convenience and consistent quality splicing. MAURIPRO furling loops are particularly popular for their competitive pricing and reliable construction.

How do I determine the correct length for my furling line?

Measure from your cockpit (where you'll operate the line) to the furling drum, then back to the cockpit, adding extra length for routing through blocks and fairleads. For continuous lines, add 10-15% extra for splicing and adjustment. MAURIPRO offers pre-made furling loops in 7, 8, and 9-foot lengths to fit most common boat configurations. Consider that longer lines provide more mechanical advantage but create more friction, while shorter lines offer quicker response but require more effort to operate.

Can I replace just the furling line without replacing the entire furling system?

Yes, furling lines can be replaced independently as they're wear items that need periodic replacement due to UV exposure and friction. Ensure the new line matches your drum's groove specifications and diameter requirements. Facnor, Harken, Selden, and MAURIPRO furling lines are designed to work with most standard furling systems, though it's best to match the brand when possible. The key is proper diameter sizing - using incorrect diameter can cause poor winding, slippage, or premature wear of both the line and drum.

What makes Facnor furling lines more expensive than other brands?

Facnor furling lines come pre-assembled with webbing attachments and are engineered specifically for Facnor furling systems, ensuring optimal performance and longevity. They use premium double-braid construction with UV-resistant treatments and precise diameter control for smooth drum operation. The higher price reflects the convenience of ready-to-install systems and Facnor's reputation for quality hardware. MAURIPRO furling loops offer excellent value as an alternative, providing reliable performance at significantly lower cost while maintaining proper diameter specifications for most furling systems.

Shipping & Support

MAURIPRO offers free US shipping on orders over $99, a price-match guarantee on all furling lines, and dedicated rigging experts available by phone or email. Contact our rigging team for personalized product recommendations.