Waterproof watch strap, fluororubber (FKM) watch band, premium quality, for sports, width: 20, 21, 22 mm.
Watch Strap Size Chart and Measuring Instructions
Step 1: Measure Lug Width
- Using a ruler or caliper, measure the width of the space between the lugs of your watch where the strap will attach. This measurement will determine the lug width.
Step 2: Measure Wrist Size
- Wrap a flexible measuring tape or string snugly around your wrist, just below the wrist bone.
- Note the measurement in inches or centimeters.
Step 3: Determine Strap Length
- Measure the distance between the lug ends of your watch to determine the ideal strap length. This measurement should correspond to your wrist size and desired fit.
- For a comfortable fit, add 1,5 to 2 inches (3.5 to 5 centimeters) to your wrist size measurement.
Step 4: Consult the Size Chart
| Wrist size (inch/cm) | Watch strap length (2 pieces) | Watch strap length (one-piece) |
|
5.5 - 6.5 inch / 14 - 16.5 cm |
S: 110-70 mm | 230 cm |
|
6 - 7 inch / 16.5 - 18.5 cm |
M: 120-80 mm | 250 cm |
|
7 - 8 inch / 18.5 - 20.3 cm |
L 135-80 mm | 270 cm |
Tapered sizes:
Tapered size refers to a gradual reduction in watch strap width from one end to the other. In the context of watch straps, a tapered design typically features a wider width near the lug attachment point of the watch and gradually narrows towards the buckle or clasp end. This tapered shape not only enhances the aesthetic appeal of the strap but also offers a comfortable fit, ensuring it conforms smoothly to the wrist. Tapered straps are often favored for their stylish look and ergonomic design, providing a sleek and refined appearance when paired with various timepieces.
Please Note:
The wrist size mentioned refers to the circumference of your wrist at the location where you typically wear your watch.
The length guide provided is approximate and applies to the straps depicted in the images. Variations in fit may arise due to variances in wrist shapes, buckle or clasp types, and differences in watch case sizes or shapes, which cannot be entirely accounted for.
Additionally, individual differences in hand size and structure may further influence fit.
Do not hesitate to contact us prior to order placing i case of any questons related to custom order sizing.
This watch strap is made from premium fluororubber (FKM), a high-performance material originally developed for aerospace, diving, and industrial applications where long-term stability is essential. Unlike standard silicone, FKM is chemically inert, non-porous, and engineered for continuous use in demanding environments.
The surface of FKM does not generate static electricity, meaning it does not attract dust, lint, or pet hair. The strap maintains a clean, consistent appearance throughout the day, even with daily wear — a practical difference that is immediately noticeable compared to silicone.
FKM is resistant to sweat, skin oils, salt water, perfumes, and UV exposure. It does not become sticky over time and does not degrade from contact with the skin. The material retains its elasticity and structural integrity across a wide temperature range, from –40°C to +225°C, making it suitable for travel, sports, and water use without seasonal limitations.
On the wrist, FKM feels denser and more substantial than silicone. Its controlled flexibility and added mass create a balanced feel, especially with heavier steel watches. The strap sits securely, without excessive movement, and remains comfortable from the first wear without requiring a break-in period.
The strap is slightly tapered for improved ergonomics and visual balance. Standard sizing follows a watch lug width × buckle width format:
20×18 mm, 21×18 mm, 22×18 mm.
This taper reduces bulk at the buckle while preserving stability near the case.
Compatible with most watch brands and models using standard 20 mm, 21 mm, or 22 mm lug widths.
Strap length is 125 / 80 mm, suitable for wrist sizes from 16 cm to 22 cm in circumference (S–L). The fit covers a wide range of wrist profiles while maintaining correct buckle placement and hole spacing.
Thickness is 5 mm at the watch lugs, tapering to 2.5 mm at the strap edge. This profile provides strength and visual presence near the case, while keeping flexibility and comfort at the wrist.
This strap works equally well with modern sports watches, tool watches, and contemporary daily wear pieces. It is designed as a long-term alternative to silicone rather than a seasonal accessory.
Why choose this FKM Rubber Strap
- Premium fluororubber (FKM), not silicone
- Dust-free surface with no static attraction
- Chemically inert: resistant to sweat, oils, salt water, and perfume
- Wide temperature tolerance (–40°C to +225°C)
- UV-stable, does not fade or crack
- Slight taper for better ergonomics (20×18 / 21×18 / 22×18 mm)
- Solid, balanced feel ideal for heavier watches
- Hypoallergenic and skin-safe
- Comfortable from the first wear, no break-in
Watches shown in photos are not included.
FinWatchStraps is not affiliated with, endorsed by, or authorized by Rolex, Omega, Tudor, Blancpain, Tag Heuer, Apple or Swatch Group as well as other watch brands. All watches, likenesses and logos are trademarks or registered trademarks of their respective owners.
Our goal is to ensure swift delivery of your order. Therefore, all ready to ship orders are processed and shipped within three business days of order confirmation.
Custom made items require 1-4 weeks for production, depending on order complexity and customization requests.
For international orders, we utilize reliable services such as DHL Express, UPS and Fedex. Economy airmail is offered for a reduced price, kindly note this shipping method is not tracable and takes 3-4 weks to get delivered by Posti and your country national post.
Meanwhile, local orders within Finland are shipped via Posti.
Please be aware that the transit times provided on our website are estimates only, and actual delivery times may vary depending on factors such as your location, weather conditions, public holidays, customs processing, and other unforeseen circumstances beyond our control.
International orders may be subject to duties and import taxes determined by your local customs authority. Additionally, the logistics carrier may impose a brokerage fee.
Please note that FinWatchStraps does not assume responsibility for the payment of any duties, taxes, or brokerage fees incurred, nor for customs inspections or transit delays. These charges are determined and collected by your country's government, and you may be required to settle them upon receipt of your shipment.
