Finding the perfect strap or accessory for your watch can greatly enhance comfort and style. Our sizing guides help you measure your watch accurately, ensuring the best fit. Whether you have a traditional watch or an Apple Watch, we provide step-by-step instructions to determine the ideal strap size and watch lug width. With these guides, you can confidently choose the perfect straps and accessories to enhance your watch.
2) Print File. In print options dialogue box, uncheck any “shrink oversized pages to fit” or “fit to page” boxes.*IMPORTANT!*
3) After printing, test the accuracy by measuring the “one inch” test strip with a standard ruler.
4) Cut off the inch ruler from the side and wrap around your wrist to determine your wrist size.
5) Hold your watch with the lugs framing the blocks below to determine your lug width. There should be no gap or overlap.
Lug Width Measurement:
To determine your lug width, print the BluShark Watch Sizing Guide in step-1 and place your watch on the measuring blocks located on the bottom of the guide.
• Apple Watch Instructions
1) Open Our Apple Watch Sizing Guide Here.DownloadHere
2) Print File. In print options dialogue box, uncheck any “shrink oversized pages to fit” or “fit to page” boxes.*IMPORTANT!*
3) Cut out the tool. Position the wider end where you would wear a watch. For a more accurate measurement, you can use a piece of tape to hold the wider end in place.
4) Wrap the tool around your wrist, keeping it in place. Make sure the tool feels snug and doesn’t slide up or down.
5) Note the inch number the arrows point to – that’s your band size.
6) If the arrows land between two measurements, choose the smaller of the two numbers closest to the line.
Adapter Measurement:
To determine which size adapter you need, use the following guide:
If your Apple Watch is 42mm, 44mm, or 45mm, you’ll need an adapter that measures 22mm.
If your Apple Watch is 38mm or 40mm, you’ll need an adapter that measures 20mm.
If you have a 41mm Apple Watch, choose the 20mm adapter.
Unsure of your case size? You can usually find it on the back of your Apple Watch, near the sensor. Or, open the Apple Watch app on your iPhone, go to "My Watch" at the bottom, then tap General > About.
Prices shown are in USD. Applicable taxes and shipping fees are calculated at checkout based on your location.
The Apple Watch ULTRA O2 Strap Band is the rugged two-piece version of the ever popular BluShark Straps Original. The double layer of nylon adds extra durability, effectively doubling the strength of the strap, while the sliding second keeper ensures your strap stays tucked in just the way you like it, offering personalized comfort and style.
2.4mm thick dual-layer nylon construction cleanly stitched around the perimeter
Premium stainless steel buckle
Fixed and Sliding stainless steel keepers
Quick release spring bars
Two Strap Lengths Included! This unique feature allows you to try on both sizes and select the one that perfectly complements your wrist, ensuring an ideal fit every time. With the preinstalled quick-release pins you can easily swap adapters to the size that fits your wrist best!
Note: We are in no way affiliated with Apple and/or Apple's products. We are a third-party seller of watch bands that are compatible with the Apple Watch. • Apple, Apple Watch, and Apple Watch Ultra are trademarks of Apple Inc., registered in the U.S. and other countries.
Orders ship from our Tucson, AZ warehouse. US orders deliver fast with free shipping on $50+ and low-cost standard options; international shipping is available via UPS and DHL with full tracking.
We offer Free Returns with pre-paid return labels! Items can be returned or exchanged within 30 days if unused. Discounted or worn products may not qualify, and refunds for bundle deals are adjusted accordingly.
All straps are covered against manufacturing defects for life. If you experience a defect, simply contact us with your order details for a free replacement. Normal wear, misuse, and cosmetic aging are not covered.
Solid option to change up the look of the watch. Has a tendency to rattle a bit when I get a notification on my watch. A bit stiff but it looks nice overall.
Great strap fantastic quality. It is quite stiff, bit it shapes to the wrist quite well after a couple days. Getting it wet helps along the process. I was worried, because a lot of cloth type straps stay wet and clammy too long. This one stays wet for a bit but doesnt feel clammy, and dries pretty fast. Super nice quality clasps too. Goes great on my garmin, and is more comfortable than the silicone strap it came with in this heat. Would highly recommend. Love that it comes with two of the non clasp side of the bands. They are different sizes so you can use the one that fits. My wrist is on smaller side and the smaller strap hooks right on thr middle hole. Great band and the color is perfect.
It's a good strap, and I like that it comes with both a short and long version.
Would have given it the full 5 starts if there was an option to not have the easy fit bar installed. I like the old version which can not come off without a fight.
Good quality, and looks great with the watch. The pins were easy to install the band. Smaller diameter than the original's but seem to do the job. A bit stiff initially, but will become a bit more flexible with time. No complaints.
The wristband is nicer than the one that came with my Hamilton mechanical field watch. I bought two so I have a replacement when the original wears out.
These straps are quite stiff initially and will need to be broken in a bit. Not quite as smooth as I had hoped underneath but hopefully will smooth out over time. Quality is fair, the material at the end of the band is rough and fraying a bit out of the package. The spring arms work okay but are much lighter than my original pins. Looks good with the watch. Want something other than the leather band.
Store owner replied:
Hey Bradley,
These definitely have a break in period because of the double-layered material, but after wearing daily it'll form your wrist nicely.
The fraying on the end seems unusual for this strap. A quick passing of the lighter will clear those up quick, but we're always happy to send out a free replacement if it becomes unwearable. Feel free to reach out to our support team if you'd like a replacement.
Very nice band for a field watch. It Seemed a little stiff when it arrived, but it’s softened up with a few days use. I think it looks great with the watch and a good overall value.
Strap is great as are all of the straps I’ve purchased! I’m up to around 8 different ones now. All the different materials and models I’ve gotten are of high quality and exactly as described and pictured.
Awesome product. Goes well with my Invicta watch and much more comfortable than the original band. I chose the longer strap so I could use both keepers.
Absolutely the best 2 piece NATO I’ve ever had! They usually feel like a ribbon from a Xmas present was made into a watch strap. This one is ALL double thickness -so it feels very substantial.
Cost a bit more than the typical NATO but, well worth the difference!
Solid option to change up the look of the watch. Has a tendency to rattle a bit when I get a notification on my watch. A bit stiff but it looks nice overall.
Great strap fantastic quality. It is quite stiff, bit it shapes to the wrist quite well after a couple days. Getting it wet helps along the process. I was worried, because a lot of cloth type straps stay wet and clammy too long. This one stays wet for a bit but doesnt feel clammy, and dries pretty fast. Super nice quality clasps too. Goes great on my garmin, and is more comfortable than the silicone strap it came with in this heat. Would highly recommend. Love that it comes with two of the non clasp side of the bands. They are different sizes so you can use the one that fits. My wrist is on smaller side and the smaller strap hooks right on thr middle hole. Great band and the color is perfect.
It's a good strap, and I like that it comes with both a short and long version.
Would have given it the full 5 starts if there was an option to not have the easy fit bar installed. I like the old version which can not come off without a fight.
Good quality, and looks great with the watch. The pins were easy to install the band. Smaller diameter than the original's but seem to do the job. A bit stiff initially, but will become a bit more flexible with time. No complaints.
The wristband is nicer than the one that came with my Hamilton mechanical field watch. I bought two so I have a replacement when the original wears out.
These straps are quite stiff initially and will need to be broken in a bit. Not quite as smooth as I had hoped underneath but hopefully will smooth out over time. Quality is fair, the material at the end of the band is rough and fraying a bit out of the package. The spring arms work okay but are much lighter than my original pins. Looks good with the watch. Want something other than the leather band.
Store owner replied:
Hey Bradley,
These definitely have a break in period because of the double-layered material, but after wearing daily it'll form your wrist nicely.
The fraying on the end seems unusual for this strap. A quick passing of the lighter will clear those up quick, but we're always happy to send out a free replacement if it becomes unwearable. Feel free to reach out to our support team if you'd like a replacement.
Very nice band for a field watch. It Seemed a little stiff when it arrived, but it’s softened up with a few days use. I think it looks great with the watch and a good overall value.
Strap is great as are all of the straps I’ve purchased! I’m up to around 8 different ones now. All the different materials and models I’ve gotten are of high quality and exactly as described and pictured.
Awesome product. Goes well with my Invicta watch and much more comfortable than the original band. I chose the longer strap so I could use both keepers.
Absolutely the best 2 piece NATO I’ve ever had! They usually feel like a ribbon from a Xmas present was made into a watch strap. This one is ALL double thickness -so it feels very substantial.
Cost a bit more than the typical NATO but, well worth the difference!
Find Your Strap Size Here
