| Citizen |
Promaster Dive BN0150 |
44mm |
Material Families for 20mm Bands
Watchband.direct stocks every major strap material in 20mm. Pick by occasion, climate and watch style. Each material below links to the full 20mm sub-collection.
Classic leather straps for dress and casual wear (80 options).
Sport and dive ready, sweat and water resistant (38 options).
Tough rubber and FKM straps for diving and active use (38 options).
Lightweight tactical and field strap options (32 options).
Bracelets, mesh and Milanese in steel (27 options).
Curved end, straight end and three-link options (27 options).
Tool-free swap straps with spring bar levers (38 options).
Or browse everything: All 20mm Bands (227 products).
Which Material for Which Occasion
Casual Everyday
For your daily rotation, a classic leather strap is the primary choice for your 20mm watch. Leather provides a timeless look that pairs effortlessly with jeans or chinos. It offers supreme comfort as it gently molds to your wrist over time. However, leather lacks water resistance and can degrade if you sweat heavily. Your best alternative is a canvas strap. Canvas delivers a rugged, relaxed aesthetic and superior durability for everyday wear. While it handles moisture much better than leather, it might feel slightly stiff during the initial break-in period.
Dress and Formal
When attending a formal event, a fine alligator or crocodile leather strap is the ultimate primary option. This material elevates your watch with an elegant, polished look that slips easily under a tailored shirt cuff. The main trade-off is durability, as formal exotic leather is delicate and strictly non-waterproof. If you prefer a metal option, a stainless steel Milanese mesh bracelet is an excellent alternative. Mesh provides a sophisticated, vintage shine and absolute water resistance. The downside is that metal can feel heavier and occasionally catch on wrist hair, though it remains a highly durable choice.
Sport and Gym
High-intensity activities require a strap that can handle sweat and constant movement. A high-quality silicone strap is your primary recommendation here. Silicone is exceptionally comfortable, completely waterproof, and easy to wash after a heavy workout. However, it can attract lint and often presents a highly casual look. A nylon NATO strap serves as a fantastic alternative. Nylon is incredibly durable and offers a highly secure fit, with a few specific trade-offs:
- Comfort and Breathability: Nylon breathes much better than solid silicone, keeping your wrist cooler during exercise.
- Water Resistance: Nylon absorbs sweat and takes time to dry, whereas silicone wipes clean instantly.
Dive and Water
For swimming or diving, FKM rubber is the primary material of choice. Unlike standard silicone, FKM rubber offers extreme durability and resistance to salt water, UV rays, and harsh pool chemicals. It provides excellent comfort and a sleek look, though it remains inherently sporty. Your alternative is a classic stainless steel bracelet. Steel boasts unmatched longevity and transitions beautifully from the beach to the office. The trade-offs include a noticeably heavier weight on the wrist, a susceptibility to surface scratches, and a lack of flexibility compared to soft rubber.
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Sizing and Fitting Basics
Confirming Your 20mm Lug Width
Before purchasing a 20mm watch band, you must ensure it will actually fit your timepiece. The lug width is the internal distance between the two horns on the watch case. Even a single millimeter off will result in a strap that is too tight to install or too loose, which can cause your watch to detach and fall. You can confirm your lug width in three simple ways. First, measure the distance precisely with digital calipers. Second, check the back of your original strap to see if a "20" is stamped into the material. Third, look up your exact watch reference number online to find the official manufacturer specifications.
Spring Bar Basics
Watch bands are secured to the case using small metal tubes called spring bars. Standard spring bars require a specialized forked tool to compress the spring-loaded ends for both removal and installation. Quick release spring bars, on the other hand, feature a tiny built-in lever. You simply slide the lever with your fingernail to retract the pin, making swapping straps a fast, tool-free process. To install either type, insert one end of the pin into the first lug hole, compress the opposite end, and gently slide the strap into place until you hear the pin click securely into the second hole.
Strap Length Variants and Wrist Measurement
Watch straps come in several length variants to accommodate different body types. These generally include short, regular, long, and XL. Regular lengths fit most average wrists, while short or XL options are tailored for smaller or much larger wrists respectively. To find your ideal fit, you need to measure your wrist circumference.
- Wrap a flexible measuring tape or a piece of string around your wrist just above the wrist bone.
- Mark the exact point where the tape or string overlaps.
- Lay the string flat and measure the distance with a standard ruler.
Compare this final measurement to the strap length specifications provided by the manufacturer to choose the correct variant for a comfortable fit.
Taper Conventions
Finally, consider the taper of the strap. A straight strap remains 20mm wide from the lugs all the way down to the buckle. Alternatively, many bands feature a tapered design, such as a 20mm/18mm taper. This means the strap is 20mm at the watch case but gradually narrows down to 18mm at the buckle. Tapered straps generally offer a more refined, vintage, or dressy look, while straight straps provide a robust, casual aesthetic. If you plan to reuse your original watch buckle, you must pay close attention to this taper measurement to ensure your old hardware will fit the new band.
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Frequently Asked Questions
Will a 20mm band fit a watch with a 19mm or 21mm lug width?
It is not recommended. Squeezing a 20mm strap into a 19mm lug creates bunching and puts excessive stress on the spring bars, which can cause them to fail. Conversely, putting a 20mm band on a 21mm watch leaves a visible gap. This gap allows the spring bar to slide back and forth, risking detachment and dropping your watch. Always match the band exactly to your measured lug width for optimal security and aesthetics. Some soft nylon straps might squeeze into 19mm, but precise sizing is always the safest choice.
Do I need an adapter to use a 20mm band on a smartwatch?
It depends on the smartwatch brand. Many popular smartwatches, like the Samsung Galaxy Watch or Garmin Vivoactive, feature standard 20mm lugs and accept any regular 20mm band directly. However, proprietary systems like the Apple Watch require a specific metal adapter. These adapters slide into the proprietary slot on the watch case and provide standard 20mm lugs on the other side. Always check your specific smartwatch model specifications to see if it uses standard spring bars or requires a brand-specific mounting system before purchasing a new strap.
What is the difference between strap and bracelet sizing at 20mm?
While both start at a 20mm width at the watch lugs, they differ in taper and length adjustments. A 20mm leather or rubber strap often tapers down to 18mm or 16mm at the buckle for a refined look, and you adjust the fit using pre-punched holes. A 20mm metal bracelet might maintain a straight 20mm width or taper slightly. Metal bracelets require removing or adding physical metal links using specialized tools, and they often feature micro-adjustment holes on the clasp to achieve a precise fit on your wrist.
Should I choose quick release or traditional spring bars for a 20mm band?
Quick release spring bars feature a small built-in lever that allows you to swap bands in seconds using only your fingernail. This is ideal for people who like to change their watch style frequently without risking case scratches. Traditional spring bars require a specialized forked tool for removal and installation. While traditional bars take more effort to change, many dive watch enthusiasts prefer them because they lack the lever cutout, making them slightly thicker and structurally stronger for intense physical activities or heavy water resistance needs.
How long does each 20mm watch band material typically last?
Lifespan varies heavily based on material and daily wear. High quality stainless steel bracelets can easily last a lifetime with proper care. Nylon NATO straps are highly durable and generally last three to five years before fraying. Vulcanized rubber bands resist water and UV light, typically surviving five to ten years before becoming brittle. Genuine leather straps have the shortest lifespan, usually lasting one to two years of daily wear, as sweat, moisture, and frequent bending eventually degrade the organic fibers and cause cracking.
Are 20mm bands interchangeable across all watch brands?
Generally, yes. The 20mm lug width is a universal standard in the watchmaking industry. If your watch has a 20mm lug width and uses standard spring bars, it will accept almost any aftermarket 20mm strap. The main exceptions are watches with integrated bracelets, proprietary mounting systems, or highly curved cases that require specially molded strap ends. While a generic 20mm straight-end strap fits almost all standard lugs, curved-end metal bracelets must be manufactured specifically for your exact watch model to align perfectly with the case geometry.
What is the strongest material available for a 20mm watch band?
Stainless steel and titanium are the strongest overall materials for 20mm bands, offering unmatched resistance to tearing, impact, and heavy tension. For flexible materials, seatbelt-grade woven nylon is exceptionally strong. Nylon NATO straps are specifically designed for security. They pass continuously behind the watch case, ensuring that if one spring bar breaks, the watch remains securely attached to your wrist. Vulcanized rubber is also incredibly tough and highly resistant to environmental damage, making it a top choice for professional divers and harsh outdoor environments.
What is the most comfortable 20mm band material for daily wear?
Comfort is subjective, but silicone and premium sailcloth or canvas are widely considered the most comfortable for everyday use. Silicone is exceptionally soft, lightweight, and conforms perfectly to the wrist without requiring a break-in period. For office environments, fine calfskin leather offers a highly breathable and soft fit once it molds to your wrist shape over a few days. Perforated leather or ribbed rubber straps are also excellent choices for daily wear, as they allow trapped heat and sweat to escape during warmer weather.
How do I clean and maintain a 20mm watch band?
Maintenance depends entirely on the material. You should wash rubber, silicone, and nylon straps with warm water and mild dish soap, then let them air dry. Metal bracelets benefit from an occasional scrub with a soft toothbrush and soapy water to remove trapped dirt between the links. Leather straps require the most care. Never soak leather in water. Instead, wipe the leather gently with a slightly damp cloth to remove sweat, and apply a specialized leather conditioner every few months to prevent the material from drying out and cracking.
