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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.
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.
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
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.
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.
Every reviewer I checked out seemed to feel that this strap was top notch. I fully agree.
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.
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!
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Bainbridge Island, WA 98110
© 2025, Holben's Fine Watch Bands | Last updated: 01/15/2025