The Casio F-91W does not need a complicated introduction. It is one of the simplest digital watches you can buy and one of the easiest to recognise. The new F-91WF collection keeps that familiar formula but changes the part that has the greatest effect on comfort and character: the strap. Instead of the usual resin band, each watch comes with a lightweight cloth strap made from recycled PET.
There are three models in the collection. The F-91WF-1A is black, the F-91WF-2A is navy blue and the F-91WF-3A is olive green. The case colour is matched to the strap on each version, so none of them looks like an ordinary F-91W with a random replacement strap. They feel like a complete collection with three clear personalities.
Why the F-91WF is more than a strap change
The cloth strap is the main news but it is not only a visual detail. Casio describes it as lightweight, comfortable, resistant to scratches and resistant to stains. It should also feel less rigid than a resin strap, especially during hot weather or when the watch is worn for a full day. Its recycled PET material gives the range a practical environmental benefit without changing the affordable and uncomplicated nature of the F-91W.
The strap fits wrists from 145 to 215mm. That broad range matters because the case itself is very compact. It measures 38.2mm from top to bottom, 35.2mm across and only 8.5mm thick. Each version weighs just 21 grams. On the wrist it should almost disappear, which remains one of the strongest reasons to choose an F-91WF over a larger digital watch.
Casio F-91WF-1A: the classic black choice
The F-91WF-1A is the safest choice in the range. Its black resin case and black cloth strap preserve the familiar appearance of the original watch while giving it a softer and more casual feel. The dark colour also keeps attention on the rectangular display. A white edge glow surrounds the crystal and makes the display stand out clearly against the black case.
This is the version for someone who wants one small digital watch that works with almost anything. It is discreet enough for daily use but the woven strap adds texture that the standard resin band does not have. If you like the traditional F-91W appearance and simply want a more comfortable strap from the factory, the black model is the obvious answer.
Casio F-91WF-2A: navy without too much colour
The F-91WF-2A uses a navy blue case and matching strap. It is more colourful than the black model but still easy to wear. Navy works particularly well here because it gives the watch a different identity without turning a modest digital Casio into something loud. Its crystal is surrounded by a blue edge glow that matches the case and pulls the whole design together.
The blue tone also suits the design around the display, where the familiar colour accents already include blue. From a distance this model may look nearly black in low light. In daylight the navy case and woven strap become more obvious. It is a good middle option for buyers who find black too predictable and olive green too strongly connected with outdoor clothing.
Casio F-91WF-3A: the olive-green favourite
The F-91WF-3A has the strongest personality of the three. Its olive-green case and strap give the small digital watch an outdoor look that fits the fabric material perfectly. The colour makes the watch feel less like a basic electronic tool and more like a deliberate part of a casual outfit. The green edge glow surrounds the crystal and completes the colour scheme. It is by far the nicest of the three in my opinion.
Green is also the colour that best explains why this collection exists. A black cloth strap is useful and navy is attractive but olive green transforms the character of the F-91W most clearly. It still has the same compact size and familiar display yet it looks fresh enough to justify owning it alongside a standard black model.
The familiar Module 593 features
All three watches use Casio’s Module 593. The display shows the hour, minutes, seconds, date and day, with a PM indicator when the 12-hour format is selected. You can also switch to 24-hour time. Accuracy is rated at plus or minus 30 seconds per month, which is completely acceptable for a simple quartz digital watch.
The 1/100-second stopwatch is still one of the coolest features. It can measure elapsed time, split time and first and second-place finishes up to 59 minutes and 59.99 seconds. There is also a daily alarm and an hourly time signal. These are basic functions by modern smartwatch standards but they are quick to reach and do not need an app, an account or a charger.
A green LED illuminates the display in the dark. Power comes from one CR2016 battery with an estimated life of about seven years. That long battery life is one of the great advantages of this watch. You can put it on and use it without thinking about charging or changing the battery.
What you should know before buying
The case and bezel are resin and the crystal is resin glass. That keeps the weight low but the front can collect scratches more easily than mineral glass or sapphire. Casio lists the watches simply as water resistant. They are suitable for normal daily splashes but this is not a diving watch and it should not be treated like one.
Those limits are part of the F-91W formula. You are not paying for premium materials, advanced sensors or phone connectivity. You are buying a clear display, useful timing functions, a seven-year battery and a watch light enough to forget on your wrist. The new strap makes that package more comfortable and gives buyers three styles without spoiling the original design.
Price and release
The F-91WF collection is scheduled for an August 2026 launch. Official regional prices have not been announced yet but the watches are expected to cost around $50, €43 or £37. Final prices may vary slightly between countries because of taxes and regional distribution.
Conclusion
The F-91WF does not try to modernise the F-91W with unnecessary technology. It keeps the tiny resin case, simple display, useful stopwatch and excellent battery life then adds a cloth strap that should be comfortable from the first day. That is a small update but it is the right one for a watch built around simplicity.
My first choice is the olive-green F-91WF-3A. The green case and strap give this familiar design the most character and make the fabric version feel properly different. After the green model I would choose the black F-91WF-1A because it keeps the classic look and will be the easiest to wear every day. The navy F-91WF-2A remains a good third option for anyone who wants colour without going all the way to green.
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