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.
Inspired by the 1960's Swiss-made rubber TROPIC straps, we decided to create our own take on this beloved vintage rubber watch band. When swimmers and outdoorsmen wanted an alternative to the traditional steel bracelet, they found the solution in these waterproof and durable straps. Our Tropical style rubber watch straps are super soft, super flexible, sweat-proof, and perfect for everyday use.
There is a slight (2mm) taper from the watch case to the buckle and measures 3.3mm at the lug connection. Two sliding rubber keepers keep everything in place.
FKM rubber
Color: Gray
130mm x 80mm
Fits Wrists: 6.5" to 8.5"
Flexible yet durable
Double floating rubber keepers
Premium brushed stainless steel buckle
Quick-release pins pre-installed for easy strap changes
Spring Bar: Standard Spring Bar - 1.7mm body and 0.7mm tip
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.
A well built rubber strap. Paired with my Seiko SPB145 it looks incredible. This was my first purchase from BlueShark and it most certainly won’t be my last! Well done BlueShark!
The strap itself is great. It’s soft, supple, and wears well. However, it is long - too long for my taste at least. I wish they offered a shorter length.
Store owner replied:
Hey Derek,
You might find our Neo Tropical strap to be a better option. This comes with two strap lengths to help you find the best fit. Feel free to reach out to support and we'd be happy to help set up a free exchange or return.
Fantastic FKM Strap for Larger Wrists! The Blu Shark Tropical FKM rubber strap is an excellent choice for anyone with a larger wrist. At 130mm x 80mm (210mm total length), it fits my 8.25-inch wrist perfectly with room to spare. Finding high-quality, longer straps is usually a major challenge, so I am incredibly grateful Blu Shark offers this size. Unsurprisingly, the quality is top-notch and completely matches the high standard of their famous nylon straps. It is a total win-win. Highly recommended!
Tgisnstrap is fantastic!! It is actually perfectly sized foe my 8.25 inch wrist. I love hownit feels and it has amazing flexibility but is significantly strong. Excellent product.
Great color selection. Very comfortable out of the box. Robust, high quality materials and construction yet very supple. Very happy with all of my Blushark straps.
As always BluShark came through with awesome customer service and FAST shipping. The tropic strap feels amazing, quality is outstanding, and the white looks great on my watch! BluShark is always my first choice for great straps at amazing prices.
Store owner replied:
Thanks for sharing with us, Rahib!
I’ve ordered a couple of them now, most recently for a seiko 5 sports. I ordered a couple from Amazon that broke immediately while putting them on. Blushark has pulled thru again with an amazing strap!
Just like the great straps that I purchased for my Iwatch, the straps are super comfortable. The fit is perfect, color vibrant and they get lots of compliments. I recommend BluShark for the quality and selection. The price is more than reasonable too.
The white tropic style strap is flexible and very white! It’s the only pvd-buckled, quick release strap I’ve seen in this style, which makes it ideal for black watches like this Momentum UDT Solar watch. Excellent quality and speedy delivery.
I bought this blue tropical rubber strap to punch up my blue face/bezel Casio Duro. It came with a black rubber strap that looked okay, but was kind of cheap. With this watch you get what you pay for right? I bought the watch as a GADA dive beater after seeing it on a watch blog. It's an amazing watch for the price (<$75.00) and when I put this blue tropical rubber strap on it, it totally elevated it. Love this blue strap on the Duro. The two work really really well together and if you have this watch, you HAVE to get this strap. You won't be disappointed.
Purchased three straps and they looked amazing. I had to do an exchange which went smoothly. I ended up purchasing three more straps shortly after my first purchase. Needless to say I’ll be purchasing again.
Store owner replied:
Hey Jason,
That definitely shouldn't happen and looks to be a defect in the strap. I've just reached out to you via email so we can you a replacement ASAP.
A well built rubber strap. Paired with my Seiko SPB145 it looks incredible. This was my first purchase from BlueShark and it most certainly won’t be my last! Well done BlueShark!
The strap itself is great. It’s soft, supple, and wears well. However, it is long - too long for my taste at least. I wish they offered a shorter length.
Store owner replied:
Hey Derek,
You might find our Neo Tropical strap to be a better option. This comes with two strap lengths to help you find the best fit. Feel free to reach out to support and we'd be happy to help set up a free exchange or return.
Fantastic FKM Strap for Larger Wrists! The Blu Shark Tropical FKM rubber strap is an excellent choice for anyone with a larger wrist. At 130mm x 80mm (210mm total length), it fits my 8.25-inch wrist perfectly with room to spare. Finding high-quality, longer straps is usually a major challenge, so I am incredibly grateful Blu Shark offers this size. Unsurprisingly, the quality is top-notch and completely matches the high standard of their famous nylon straps. It is a total win-win. Highly recommended!
Tgisnstrap is fantastic!! It is actually perfectly sized foe my 8.25 inch wrist. I love hownit feels and it has amazing flexibility but is significantly strong. Excellent product.
Great color selection. Very comfortable out of the box. Robust, high quality materials and construction yet very supple. Very happy with all of my Blushark straps.
As always BluShark came through with awesome customer service and FAST shipping. The tropic strap feels amazing, quality is outstanding, and the white looks great on my watch! BluShark is always my first choice for great straps at amazing prices.
Store owner replied:
Thanks for sharing with us, Rahib!
I’ve ordered a couple of them now, most recently for a seiko 5 sports. I ordered a couple from Amazon that broke immediately while putting them on. Blushark has pulled thru again with an amazing strap!
Just like the great straps that I purchased for my Iwatch, the straps are super comfortable. The fit is perfect, color vibrant and they get lots of compliments. I recommend BluShark for the quality and selection. The price is more than reasonable too.
The white tropic style strap is flexible and very white! It’s the only pvd-buckled, quick release strap I’ve seen in this style, which makes it ideal for black watches like this Momentum UDT Solar watch. Excellent quality and speedy delivery.
I bought this blue tropical rubber strap to punch up my blue face/bezel Casio Duro. It came with a black rubber strap that looked okay, but was kind of cheap. With this watch you get what you pay for right? I bought the watch as a GADA dive beater after seeing it on a watch blog. It's an amazing watch for the price (<$75.00) and when I put this blue tropical rubber strap on it, it totally elevated it. Love this blue strap on the Duro. The two work really really well together and if you have this watch, you HAVE to get this strap. You won't be disappointed.
Purchased three straps and they looked amazing. I had to do an exchange which went smoothly. I ended up purchasing three more straps shortly after my first purchase. Needless to say I’ll be purchasing again.
Store owner replied:
Hey Jason,
That definitely shouldn't happen and looks to be a defect in the strap. I've just reached out to you via email so we can you a replacement ASAP.
Tropical Style Rubber Watch Band | Gray Watch Strap
Find Your Strap Size Here
