NATO Watch Straps: What They Are and How to Choose One

A NATO strap is one of the easiest and most affordable ways to completely change the look of a watch. Slip one on and a formal dress watch becomes a weekend casual piece in seconds. This guide covers what a NATO strap is, why people love them, how to pick the right size, and how to style them.

A watch strap from the Saltzman's Watches collection.

What is a NATO strap?

A NATO strap is a one-piece woven nylon watch band that threads through the watch's spring bars and then back through itself. The name comes from its military origins — the design traces back to a British Ministry of Defence specification, and the style was adopted by soldiers for its toughness and simplicity. Today it's a favorite among watch enthusiasts and everyday wearers alike, thanks to its rugged comfort and endless variety of colors and patterns. It's the kind of strap that's equally at home on a dive watch, a field watch, or a dressed-down luxury piece.

Why people love NATO straps

• Security — because the strap passes under the watch case, your watch stays on your wrist even if one spring bar fails.
• Comfort — soft nylon that's easy to wear in hot weather and quick to dry after water.
• Style on demand — swap colors and patterns in seconds with no tools, for a fresh look any day.
• Value — an inexpensive way to build a whole wardrobe of looks for a single watch.
• Durability — woven nylon shrugs off sweat, water, and daily wear far better than leather.

NATO, zulu, and single-pass: what's the difference?

You'll see a few related styles, and the differences are simple:

• NATO — the classic two-piece-feeling design with an extra keeper flap and a second short strap that secures the watch even if a spring bar lets go.
• Zulu — a heavier-duty cousin with thicker nylon and rounded hardware, for a chunkier, more rugged look.
• Single-pass (or "slip-through") — a thinner one-layer strap that adds less bulk under the case, which some people prefer for comfort.

All of them share the same key virtue: the watch is held securely and they're easy to swap. Which you choose comes down to the look and thickness you like.

Beyond NATO, Saltzman's also stocks leather, silicone, and metal straps.

How to choose the right size

The one measurement that matters most is your watch's lug width — the gap between the lugs where the strap attaches, measured in millimeters. Common sizes are 18mm, 20mm, and 22mm, though watches range from around 16mm up to 24mm. To find yours, measure that gap with a ruler or calipers, check your watch's specs, or simply bring the watch to us and we'll size it for you on the spot. A strap that's the right width sits snugly between the lugs without bunching or gaps. Strap length matters too — most NATOs suit an average wrist, but if you have a smaller or larger wrist, ask about shorter or longer options so the tail isn't too long or too short.

Styling a NATO strap

Half the fun of a NATO is how much it changes a watch's personality:

• Go classic with military-inspired greens, greys, and khakis for an everyday tool-watch look.
• Add color with striped or bold solid straps to make a plain dial pop.
• Keep it refined with a solid navy, black, or grey to dress a watch down without going too casual.
• Match the hardware — choose polished buckles for dressier watches and brushed or black hardware for sportier ones.

Because they're inexpensive, it's easy to keep a few on hand and rotate them with your outfit, the season, or your mood.

Caring for your nylon straps

NATO straps are famously low-maintenance, which is part of their charm. Rinse them in mild soapy water when they get dirty, then let them air dry — they handle water and sweat far better than leather. Trim and heat-seal a frayed end if needed, and keep a couple of spares so you can rotate them and extend their life. Compared with a leather strap that can crack or absorb odor over time, a nylon strap is about as fuss-free as watch gear gets.

Over 1,500 straps and bands in stock, fitted for you while you wait.

A little history: the "G10" origins

The NATO strap's story adds to its appeal. The design is rooted in a 1970s British Ministry of Defence specification, and soldiers requisitioned the strap using a form that gave the style its enduring nickname, the "G10." The original was a simple grey-and-nylon band built for reliability in the field, with that clever extra keeper so a soldier wouldn't lose a watch if a spring bar broke. Civilian enthusiasts later embraced it, and it exploded in popularity as watch fans discovered how cheaply and easily it let them reinvent a watch. Today's straps come in countless colors and patterns, but they all trace back to that practical military design — function first, style as a happy bonus.

NATO vs. leather vs. metal bracelet

Which strap style is right for you? Each has its place:

• NATO / nylon — the most casual, comfortable, and water-friendly, and by far the easiest to swap. Ideal for sport and everyday wear.
• Leather — the dressiest option, warm and classic, perfect for the office and evenings out, though it's less fond of water and sweat.
• Metal bracelet — the most versatile and durable, dressy or sporty depending on the watch, and built to last for years.

The beauty of it is you don't have to pick just one. Many owners keep a metal bracelet, a leather strap, and a couple of NATOs for the same watch, and switch based on the occasion. We can help you build that little wardrobe and fit each option for you.

The easiest upgrade in watches

If you want to fall back in love with a watch you already own, a fresh strap is the fastest, most affordable way to do it — far cheaper than a new watch and dramatically different in effect. It's also a great low-cost gift for the watch lover in your life. Grab a couple of NATOs, and suddenly one watch feels like three. That combination of low cost and high impact is exactly why enthusiasts are so passionate about them.

More strap options at Saltzman's

NATO is just the start. Saltzman's keeps over 1,500 straps and bracelets in stock — nylon, leather, silicone, and more — so you can dial in exactly the look and feel you want. Prefer the polish of a metal bracelet, the classic look of leather, or the sporty comfort of silicone? We have those too, and we'll fit any of them for you while you wait. Explore our straps collection online or come try a few in person — it's much easier to choose when you can see the colors against your actual watch.

How to change a NATO strap yourself

One of the best things about a NATO is that swapping it takes seconds and needs no tools. Simply slide the nylon under one spring bar, pass it across the back of the watch case, thread it under the other spring bar, and feed the tail through the keepers and buckle. Because the strap goes under the case rather than clipping between the lugs, you never have to compress a spring bar, which is why it's so beginner-friendly and safe for the watch. If you'd rather not fuss with it — or you want to be sure a spring bar isn't worn — bring the watch in and we'll fit it while you wait and check the bars at the same time.

Frequently asked questions

How do I know what size NATO strap to buy?

Measure the lug width of your watch in millimeters — the gap where the strap attaches. Common sizes are 18mm, 20mm, and 22mm. We can also measure it for you in store.

Are NATO straps good for expensive watches?

Yes — the one-piece design keeps the watch secured even if a spring bar fails, which is part of why enthusiasts trust them for daily wear.

Can I get a NATO strap wet?

Nylon handles water and sweat well and dries quickly. Just remember that whether the watch itself can get wet depends on its own water-resistance rating.

Will a NATO strap fit my watch?

As long as you match the lug width, a NATO fits most watches with standard spring bars. Bring your watch in if you're unsure and we'll confirm the fit.

Can you put a strap on for me?

Absolutely. Bring your watch to either location and we'll fit the strap while you wait.

Saltzman's Watches — Cranston · 401-946-0930  |  Newport · 401-841-0011
A Rhode Island family watch business since 1940.