ISOfrane Poseidon Yellow Rubber Watch Strap

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Price
$139
Size/Buckle Finish:20mm/Stainless Steel

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Swiss company ISOfrane initially launched this classic dive watch strap in the early 1960s. Its innovative design and material quickly made it a favored choice among the most renowned dive watch manufacturers of the 1960s and 1970s.

Reintroduced by Synchron in 2010, ISOfrane straps are now made in Italy using an improved proprietary isoprene rubber compound for even better durability and softness. These vanilla-scented straps are 100% silicone-free, hypoallergenic, and waterproof. With a ribbed underside to prevent adhesion to skin and large slots for ventilation and water drainage, they are also non-toxic and do not attract lint or dust like silicone straps.

Material:

  • Isoprene rubber (100% silicone-free)
  • ISOfrane's Retrosicuro buckle in either brushed stainless steel or black DLC (diamond-like carbon) finish

Sizing:

  • Available in 20mm and 22mm
  • Strap/buckle taper: 20mm/20mm, 22mm/22mm
  • Thirteen sizing holes to achieve the perfect fit
  • Piece length 130mm / 75mm excluding buckle
  • Total length approximately 8" excluding buckle
  • Thickness tapers from 5.5mm at lug ends to 3.5mm at opposite ends

Includes:

  • One free pair of strong, seamless double-flange stainless steel spring bars
FAQ

Q: Do you sell watch bands for women?
A: We do! Many of our short-length straps are the perfect size for women.

Q: Can you suggest a strap that looks amazing with my watch?
A: Unfortunately, because the range is so vast (and personal taste is subjective), we cannot advise regarding aesthetic suitability for specific models and styles of watches.

Q: I have an Apple watch. Will any of your straps work for me?
A: Sure! Our handy Apple watch band adapters accommodate most 22mm straps.

Q: Are spring bars available?
A: Yes, for each strap that is not already integrated with quick-release spring bars, we include one free pair of strong, seamless double-flange stainless steel bars.

Q: What strap size do I need?
A: To determine your size, use a metric ruler to measure the internal distance (in millimeters) between the lugs of your watch.

Q: My Bonetto Cinturini deployant strap is too long. Can you help me shorten it?
A: Of course! See our Bonetto Cinturini sizing guide for cutting instructions.

Q: Do you offer international shipping?
A: Yes! Visit our Shipping & Returns page for more information.

Q: May I return my purchase?
A: Holben's Fine Watch Bands accepts returns of unworn, undamaged merchandise for refund or exchange within thirty days of purchase. Learn more on our Shipping & Returns page.

Help with sizing
  • Inspect the underside of your current watch strap for width indicators.
  • Measure the space between your watch lugs (in millimeters) using a metric ruler.
  • Research the specifications of your watch model on the manufacturer's website.
Shopping for your Apple watch

Our stainless steel adapters enable the use of virtually any 22mm watch band with Apple Watch models 1-8, SE and Ultra, and are compatible with standard or quick-release spring bars.

Shipping Info

Holben's is famous for our fast shipping!

United States:

All domestic shipping options include tracking.

FREE USPS Ground Advantage (3-5 business day transit time) for orders over $39
$4.95 USPS Ground Advantage for orders up to $39.00
$8.95 USPS Priority Mail (2-4 business day transit time)
$23.95 USPS Priority Mail Express (1-2 business day transit time)

International:

$16.95 USPS First Class Package International

Orders shipped outside of the USA may be subject to customs or import fees upon arrival in the destination country. Payment of any import duties, fees or taxes is the responsibility of the customer. Contact your local customs office for information regarding potential charges.

Returns Info

Holben's accepts returns of unworn, undamaged watch straps or accessories for refund or exchange within thirty days of purchase. (To ensure that items remain in original condition, please confirm suitability before fastening to your watch or wrist.)

All product packaging (bags, tags, cases, etc.) must be unaltered and returned with each item. Items without original packaging will be refused. Items that have been worn, resized, damaged or otherwise modified (including exposure to cologne, tobacco smoke, household air fresheners or other odors) will not be accepted.

Orders must be packed in a padded envelope or small box, and shipped via USPS with delivery confirmation. (Couriers such as DHL and UPS will not deliver to PO boxes.)

Address:

Please ship all returns to the address below, with a note stating your name, date of purchase and reason for return.

HFWB
Returns Department
PO Box 10853
Bainbridge Island, WA 98110

We are happy to help with returns and exchanges. If you have any questions, please contact us.

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Customer Reviews

Based on 7 reviews
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R
Robert
Isoftane Seiko Tuna

I bought this new Seiko Yellow Tina, wanted a yellow Isofrane strap to go with it. I turned to Holbens because of price, they were able to post to Australia.
It’s a very comfortable strap, the yellow strap smells like vanilla, where as my black Isofrane doesn’t!

The strap arrived before my watch did, fitting it was easy. It’s only a weekend watch for me.
The keepers with the Isofrane are very snug, & I must position them in place before putting it on.
In all, I’m very happy with the strap, & am looking at another purchase in future with Holbens.

S
Shane Watson
Best band made!

Immediately fell in love with this band the second it was installed, It doesn’t even feel like I’m wearing a watch with this band

T
Thad Suchy
Heavy duty strap.

I bought this strap to go with my Synchron Military Black, and it goes very well. Nice look. It is, however, rather difficult to put on the wrist. The strap does not slide on itself that easily, making it hard to get it through the keepers. This is the reason for the 4 stars.

A
Aaron Shapiro
The best diver strap you can buy

The ISOFrane is about as nice of a strap as you can get for a dive watch. It's comfortable, the keepers are well designed, and it's breathable on the wrist. Highly reccomended.

T
T.T.
Classic and very well made

Every reviewer I checked out seemed to feel that this strap was top notch. I fully agree.

T
T.B.
Heavy duty

Amazing strap for comfort on hot summer days. Made of thick rubber. I don’t really notice the “vanilla smell” some people are talking about. Only thing I’d change would be the length of the strap. It’s almost too long even on my 7.5” wrist. Oh and the price is pretty steep but you get what you pay for. Like usual, the strap shipped very fast.

D
Donny Lovelace
Rugged and Beautiful Leather Strap

I was looking for a new strap to replace the one that came with my Citizen Promaster Dive watch and cannot be any happier with the Isofrane in anthracite that I chose. It is a high quality rubber strap that perfectly complements the watch. A very rugged look that matches the tool watch aesthetics of the watch, while also being high quality. I’m sure this strap, like the watch, will serve me well for many years. Purchase from Holben’s was fast and easy. Despite being shipped across the country, I received the strap quickly. First time customer, but it won’t be my last purchase!