Biothane Long Line 5/8"

Lightweight in hand—mighty in strength.
Our 5/8” BioThane Long Lines are slim, flexible, and tough—offering 1000lb (453.6kg) break strength. That means they’re suitable for dogs of all sizes, from tiny terriers to chunky shepherds, without the bulk of heavier gear.
 
Whether you’re working on recall, heading out on a sniffari, or exploring wide open spaces, this long line gives your dog the freedom to roam safely, and gives you peace of mind with every step.
 
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Why choose a long line?
• Ideal for recall training, decompression walks, hiking & more
• Great for reactive or under-socialised dogs
• Lets dogs explore at a distance while staying secure
• Lightweight enough for small dogs, strong enough for large breeds
• A go-to tool for dog trainers, handlers, and active dog parents
 
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Customise it your way:
• Length – Choose from 7ft to 50ft
• Colour – Go bold with a single colour or pick a two-tone design (just leave your colour choices in the order notes)
• Handle or No Handle – Add a looped handle or keep it sleek with no handle (ideal for hunting dogs or training to prevent snagging)
 
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Available Hardware Options:
We offer 5/8” hardware in:
1. Stainless Steel – Our strongest and most weatherproof option. Rust-proof, scratch-resistant, and perfect for every adventure.
2. Multichrome – Bright, bold, and colourful. A statement finish that may scratch with rough use.
 
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Clasp Compatibility Note:
• Our stainless steel and multichrome trigger snaps are the only snap options that come in true 5/8” sizing, and they’re the most secure fit for this leash width.
• Other clasp styles (like lobster clasps or carabiners) are available in 3/4” and can still be used with 5/8” BioThane—just note that the fit will be slightly looser around the strap, but still fully functional.
 
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Carabiner Upgrade Available!
Upgrade your gear with our lightweight yet ultra-strong aluminum carabiner clasp. Weighing just 23g and rated for up to 400kg, it’s perfect for building secure leashes, hands-free leads, or custom setups. Featuring a twist-lock mechanism for added safety, it’s available in sleek black or classic silver. 
 
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Same strength. Sleeker feel.
The 5/8” long line is a fantastic option for anyone who wants less bulk without compromising durability. Easy to pack, easy to clean, and tough enough for every breed.
 
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Let your dog adventure far—while you stay safely connected.