Reference
Shoelace types and materials
Ten lace types, what each is for, and the widths that fit which eyelets. The lace matters more than most people expect: switching from round nylon to flat waxed cotton solves the majority of "my laces keep coming undone" complaints without changing anything about how you tie them.
| Lace type | Typical width | Used on | Characteristics |
|---|---|---|---|
| Flat cotton | 6–10 mm | Sneakers, skate shoes, high-tops | Grips well, holds a knot, frays at the eyelet over time. The default sneaker lace. |
| Flat waxed cotton | 6–10 mm | Skate shoes, boots, dress shoes | Wax coating adds friction and abrasion resistance. Holds a bow far better than any unwaxed lace. |
| Round cotton | 3–5 mm | Dress shoes, casual boots | Traditional on formal footwear. Slips more than flat; needs a secure knot. |
| Round polyester / nylon | 4–6 mm | Hiking boots, running shoes, skates | Slides freely over hooks and through fabric loops. Low friction, so knots creep. |
| Oval / semi-round | 5–6 mm | Running shoes | A compromise: slides like round, grips a little like flat. Common factory fit on trainers. |
| Kevlar-cored | 4–6 mm | Work boots, tactical boots | Cut and abrasion resistant. Expensive, and effectively unbreakable in normal use. |
| Elastic / bungee | 4–6 mm | No-tie conversions, triathlon, adaptive | Stretches to admit the foot. Loses tension over a few hundred kilometres; treat as consumable. |
| Leather / rawhide | 2–4 mm | Boat shoes, moccasins, some boots | Traditional and durable, but stiff and hard to knot securely. Often finished with a barrel knot. |
| Ribbon | 10–25 mm | Dance shoes, fashion footwear | Wide and soft. Ties flat and looks deliberate, but offers almost no mechanical hold. |
| Reflective | 6–8 mm | Running, cycling, night visibility | Retroreflective thread woven into a flat or round lace. Genuine visibility benefit at low cost. |
Binding mechanisms: how a lace actually holds
A laced shoe holds the foot through three separate mechanisms, and understanding which one is failing tells you what to change.
Tension across the throat. Each crossing pulls the two sides of the shoe together. More crossings means more clamping force but also more pressure points. Removing a crossing, as in gap or window lacing, removes force at exactly that point and nowhere else.
Friction at the eyelet. The lace bends sharply at each eyelet and the resulting friction is what stops tension in one zone bleeding into the next. This is why a surgeon's knot works: two wraps create enough friction to isolate the forefoot from the ankle entirely.
Friction at the knot. The bow itself holds only because the strands grip each other. Wax, texture and flat cross-section all increase that grip. Round nylon has the least, which is why it needs the most secure knot.
Aglets, ends and repairs
The aglet is the stiff tip that lets the lace pass through an eyelet. Plastic aglets crack, metal ones pull off, and heat-fused ends on synthetic laces eventually split. All three are repairable: crimp-on metal aglet kits cost very little, and a short length of heat-shrink tubing shrunk onto a trimmed end works nearly as well. On nylon laces, a brief pass with a lighter re-seals a fraying end.
Laces by type
Flat waxed sneaker laces
8 mm flat waxed cotton in 45 in and 54 in. The upgrade that fixes most 'my laces come undone' complaints.
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Two-tone lace multipacks
Contrast pairs for checkerboard, bi-colour and lattice patterns.
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Metal aglet replacement kit
Re-tips frayed laces so a good pair lasts another season.
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Common questions
- What is the difference between flat and round shoelaces?
- Flat laces have more surface area in contact at the knot, so they hold a bow better and sit flatter against the shoe. Round laces slide more easily through eyelets and over boot hooks, which makes them faster to tighten but more likely to come undone.
- Are waxed shoelaces better?
- For holding a knot and resisting abrasion, yes, clearly. Wax adds friction between the strands and protects the fibres at the eyelet. The trade-offs are a slightly stiffer feel and a surface that picks up dust.
- What is an aglet?
- The stiffened tip at each end of a shoelace, usually plastic, metal or heat-fused cord. Its job is to stop the lace fraying and to let it pass through an eyelet. Aglets can be replaced with a crimp kit or improvised with heat-shrink tubing.
- What width shoelace fits my shoes?
- Match the lace width to the eyelet. Dress shoes take 2–4 mm, running shoes 5–6 mm, sneakers and skate shoes 6–10 mm, and basketball high-tops up to 10 mm. A lace too wide for the eyelet will bind; one too narrow will cut into the eyelet edge.