A sling is the piece that connects everything else, which is why the right lengths on your harness matter more than the brand printed on them. The best climbing slings and runners come down to material, length, and whether you need a sewn loop or an adjustable system. Nylon absorbs more and bulks up, while Dyneema packs small and handles heat and knots far worse.
Slings are life-safety equipment, so how you use them decides whether they work. Every rated strength comes from the maker’s marking on the sling itself, not from a product description.
Instruction matters more than gear here. Our guide to what gear you need to start climbing covers the order to build a rack, and anchor building is learned from a qualified instructor rather than an article.
A Quick Note
Nothing here replaces instruction. Anchor construction, extension, and equalization are skills taught in person, and a sling used incorrectly can fail well below its marked strength. If you are unsure whether a setup is sound, do not climb on it.
Key Takeaways
- Material decides behavior: nylon stretches and tolerates heat, Dyneema packs small and does neither.
- Knots weaken any sling, and they weaken Dyneema more than nylon.
- A shoulder-length and a double-length sling cover most trad and sport needs.
- Alpine draws give you extendable protection without carrying extra gear.
- Slings are retired on age and condition, not only on visible damage.
- Never fall directly onto a static sling, since it has almost no ability to absorb that force.
How We Picked
We compared sling types rather than individual models, because lineups turn over while the materials and standard lengths stay the same. Each section covers one type and where it belongs on a rack.
We ranked types on four things: how they behave under load, how small they pack, how well they cope with abrasion and heat, and how versatile they are across disciplines.
We excluded anything without clear material marking, and we have not stated strength figures or fall factors, since those come from the manufacturer’s marking and from training rather than from a guide.
1. Nylon Shoulder-Length Slings
Why It Stands Out
A nylon shoulder-length sling is the workhorse of most racks. It handles abrasion over rock, tolerates knots better than Dyneema, and has some give under load.
Nylon also resists heat far better, which matters anywhere a rope or another sling might run across it.
Worth Knowing
It is bulkier and heavier than Dyneema at the same length. On a long rack, that difference adds up across a dozen slings.
Nylon also absorbs water and stiffens when frozen. Buy it new and keep track of its age, because a sling with an unknown history is a sling you cannot assess.
Best for: General trad use, anchors, and anywhere knots or heat are likely. Skip it if every gram counts on a long alpine route.
2. Dyneema and Dynex Slings
Why It Stands Out
Dyneema slings are dramatically thinner and lighter than nylon at comparable ratings. A full rack of them takes a fraction of the space on a harness.
They also shed water and stay flexible in cold, which suits alpine and winter use.
Worth Knowing
Dyneema has a low melting point and almost no stretch, so heat and shock loading are both serious problems. Knots reduce its strength more than they reduce nylon’s.
It also wears in ways that are harder to see than nylon fraying. Inspect carefully, and never use it where another rope or sling could run across it under load.
Best for: Alpine routes, long approaches, and racks where weight matters. Skip it where you plan to tie knots in slings.
3. Double-Length and Long Slings
Why It Stands Out
Double-length slings build anchors, extend protection around features, and sling trees and blocks that shorter ones cannot reach. One or two on a rack changes what is possible.
They also work tripled over the shoulder, which keeps them out of the way until needed.
Worth Knowing
Long slings tangle and snag more than short ones, so how you carry them matters. Most climbers keep them chained or tripled rather than loose.
Extension length affects the forces in a system, which is exactly the kind of thing instruction covers. Our guide to climbing harnesses covers what these clip to.
Best for: Anchor building and extending protection on trad routes. Skip it as your only sling length, since short ones do the daily work.
4. Alpine Draws and Extendable Runners
Why It Stands Out
An alpine draw is a shoulder-length sling tripled between two carabiners, so it clips short and extends to full length in a second. That covers two jobs with one piece of gear.
On wandering routes, extendable protection reduces rope drag more than anything else on the rack.
Worth Knowing
Building them correctly matters, because a badly built alpine draw can come apart when extended. This is a knot-free technique learned hands-on.
They take longer to deploy than a fixed quickdraw, which matters on sport routes. Our guide to quickdraws covers where a fixed draw is the better tool.
Best for: Trad routes, wandering lines, and anywhere rope drag is the problem. Skip it on bolted sport routes where speed matters.
5. Adjustable Slings and Daisy Chains
Why It Stands Out
Adjustable slings let you fine-tune length at a stance, which is useful for positioning at an anchor or working a route. Aid climbing and big-wall work depend on them.
Modern adjustable designs are rated as a single unit, which is cleaner than improvising with pockets.
Worth Knowing
Traditional daisy chains have pocket loops that are not rated the same way as the full length, and clipping them wrong is a known failure mode. Rated adjustable lanyards are the safer modern choice.
These are also positioning tools, not fall protection. Falling onto a static lanyard produces forces that the system was never intended to take, which is covered in every beginner course and our piece on top rope versus lead climbing.
Best for: Positioning at anchors, aid work, and route cleaning. Skip a traditional daisy chain if a rated adjustable lanyard is available instead.
6. Tubular Webbing by the Meter
Why It Stands Out
Bulk webbing lets you make slings to any length, tie off features, and leave material behind on a rappel anchor without losing expensive gear. It costs very little per meter.
For canyoneering and remote descents, leaving webbing rather than a sewn sling is standard practice.
Worth Knowing
Tied webbing is weaker than a sewn sling of the same material, and the knot has to be the right one, tied correctly, with adequate tails. That is training, not reading.
Webbing also lacks the markings a sewn sling carries, so you have to track its age and history yourself. Anything found in place on a route should be treated as unknown and untrustworthy.
Best for: Rappel anchors, tie-offs, and material you expect to leave. Skip it as a substitute for sewn slings on a normal rack.
Climbing Slings and Runners at a Glance
| Type | Material | Bulk | Tolerates knots | Best situation |
|---|---|---|---|---|
| Nylon shoulder length | Nylon | Higher | Better | General trad and anchors |
| Dyneema sling | Dyneema | Lowest | Poorly | Alpine and light racks |
| Double length | Either | Higher | Depends on material | Anchors and extension |
| Alpine draw | Either | Moderate | Not applicable | Wandering trad routes |
| Adjustable lanyard | Nylon mostly | Moderate | Not applicable | Positioning and aid |
| Bulk webbing | Nylon | Varies | Requires correct knots | Rappel anchors, tie-offs |
What to Look For in a Climbing Sling
Which material suits how you climb?
Nylon for general use, heat tolerance, and anywhere knots are likely. Dyneema for weight and pack size on long routes.
Many climbers carry both and use them deliberately. Mixing them on a rack is normal, provided you know which is which.
Which lengths do you actually need?
Shoulder length does the daily work, and a double length or two covers anchors and features. Very short slings serve specific jobs rather than general use.
Buy in the lengths your climbing asks for rather than a full spread. An unused length is weight you carry for nothing.
How will you inspect and retire them?
Slings age whether or not you use them, and manufacturers state retirement guidance for their own products. Read that guidance and follow it.
Write the purchase date somewhere you will find it. Our guide to retiring climbing gear covers the wider set of rules.
Is it certified and clearly marked?
Buy slings that carry the maker’s markings and certification, and buy them new from a reputable source. Secondhand soft goods have an unknown history.
Never use a sling found on a route or given to you without provenance. Falls, heat, and chemicals leave damage you cannot see.
What will it be clipped to?
Sling and carabiner choice go together, since a thin Dyneema sling in a sharp-edged carabiner is a different setup from webbing over rock. Check the whole chain.
Edges are what cut soft goods. Our guide to carabiners covers the hardware side.
Nylon vs Dyneema
Where nylon wins
Heat tolerance, abrasion resistance, and a meaningful amount of stretch. It also loses less strength when knotted, which matters if you tie slings at all.
Nylon is cheaper too, so a rack of it costs less to build and less to retire.
Where Dyneema wins
Weight and bulk, by a wide margin. On a long route or a big rack, that is the difference between comfortable and unpleasant.
It also handles water and cold better, which suits winter and alpine days. On a long route the saved bulk shows up in how easily you can find the sling you want.
Common Sling Mistakes to Avoid
Tying knots in Dyneema
Knots cut into any sling’s strength and do so more severely in Dyneema. If a setup needs a knot, use nylon and the correct knot, learned properly.
Falling directly onto a static lanyard
A sling has almost no ability to absorb a fall, so the forces go straight into the anchor and your body. Positioning gear is for positioning.
Girth-hitching a sling to a sling
A sling loaded against another sling concentrates force and heat at a single point. Standard practice uses a carabiner between them.
Keeping old soft goods because they look fine
Webbing degrades with age, sun, and chemicals in ways you cannot see. Follow the manufacturer’s retirement guidance, and read our piece on climbing grades for the rest of what beginners get told late.
Recommended Reading
- Belay devices cover the other half of the safety system.
- Approach shoes cover getting to the base of the route with a rack on.
- Indoor versus outdoor climbing covers what changes when you leave the gym.
- Climbing helmets cover the gear that matters most when an anchor is above you.
Frequently Asked Questions
What are the best climbing slings and runners?
A few nylon shoulder-length slings plus one or two double-length slings cover most trad and anchor needs, with Dyneema added where weight matters. The right answer depends on your discipline, and anchor technique matters far more than which sling you buy.
What is the difference between nylon and Dyneema slings?
Nylon is thicker, stretches more, tolerates heat better, and loses less strength when knotted. Dyneema is far lighter and thinner, sheds water, and handles heat and knots poorly, so the two are used for different jobs.
Can you tie knots in climbing slings?
Knots reduce strength in any sling and reduce it more in Dyneema, so nylon is the material to use if a knot is required. The knot itself has to be an appropriate one, tied correctly, which is something to learn in person rather than from a guide.
How long do climbing slings last?
Manufacturers publish retirement guidance for their own products based on age and use, and that guidance is what to follow. Any sling involved in a serious fall, exposed to chemicals, or showing wear should be retired regardless of age.
What sling lengths should a beginner buy?
Shoulder length handles most daily use, and a double length covers anchors and slinging features. Beyond that, buy for the specific climbing you are doing rather than assembling a full spread up front.
Are daisy chains safe?
Traditional daisy chains have known failure modes when the pocket loops are clipped incorrectly, which is why rated adjustable lanyards have largely replaced them. If you use either, use it for positioning and never take a fall onto it.
Can you use webbing instead of sewn slings?
Tied webbing is weaker than a sewn sling and depends entirely on the knot being correct. It has a real place for rappel anchors and material you intend to leave behind, and it is not a substitute on a normal rack.
Should you ever use gear found on a route?
No. Soft goods left in place have an unknown age and history, and sun, weather and past falls cause damage that is not visible.
