Garmin Vivoactive 4S Bands: Fit Guide, 18mm Sizing & How to Change Your Strap
The Garmin Vivoactive 4S uses 18mm quick-release watch bands. That single number is the most important thing to know before you buy a replacement strap, because the Vivoactive 4S (40mm case) and the Vivoactive 4 (45mm case) look almost identical but take completely different band sizes. If you own the smaller 4S, our Garmin Vivoactive 4S Replacement Straps (18mm) click straight on in seconds, no tools required. Every order is dispatched same day from Melbourne.
Which Bands Fit the Garmin Vivoactive 4S?
Garmin's own documentation confirms the Vivoactive 4S is compatible with standard 18mm quick-release bands. The band attaches with a spring bar that has a small sliding pin, so you can swap straps by hand without a jeweller's toolkit.
Our Garmin Vivoactive 4S bands collection is built specifically for this watch. Each strap in the range is cut to the correct 18mm lug width and ships with quick-release pins already fitted, so what arrives in your letterbox goes straight onto your wrist.
Vivoactive 4S or Vivoactive 4? Check Before You Order
This is the number one mix-up we see with this model range, and it's worth 60 seconds to get right:
| Model | Case Size | Band Width |
|---|---|---|
| Garmin Vivoactive 4S | 40mm | 18mm |
| Garmin Vivoactive 4 | 45mm | 22mm |
The two watches share the same features and near-identical looks, so the case size is the only reliable giveaway. Here's how to confirm which one you own:
- Check the case back. Flip the watch over. The model name is engraved on the rear of the case.
- Check the Garmin Connect app. Open Garmin Connect on your phone, tap the device icon, and the exact model name appears at the top.
- Measure the lug gap. Measure the space between the two lugs where the band attaches. 18mm means you have the 4S; 22mm means you have the standard Vivoactive 4.
If it turns out you own the larger 45mm watch, head to our Garmin Vivoactive 4 bands collection instead. An 18mm band will not fit that model.
What Are Vivoactive 4S Bands Made Of?
Our Vivoactive 4S replacement straps are made from soft, flexible silicone with a traditional pin buckle. Silicone is the same material family Garmin fits to the watch from the factory, and it suits this watch for good reasons:
- Comfortable for all-day wear. The 4S is a 24/7 health tracker, and silicone stays comfortable through sleep tracking, workouts and the workday in between.
- Easy to keep clean. A quick wipe with a damp cloth and mild soap keeps the strap looking fresh after sweaty sessions.
- Secure fit. The pin buckle locks the band at your exact wrist size, so it won't loosen mid-run the way some clasp designs can.
Multiple colours are available on the product page, which makes it easy to keep one strap for training and a second in a dressier tone for the office. See the product page for current colours and pricing.
How to Change Your Garmin Vivoactive 4S Band
The quick-release system means the whole job takes under a minute:
- Flip the watch face down onto a soft surface.
- Locate the small sliding pin on the underside of the band, next to the lug.
- Slide the pin inwards with your fingernail. The band pops free of the case.
- Repeat on the second band half.
- To fit the new band, seat one end of the spring bar in the lug hole, slide the pin in, align the other end, and release. You'll feel it click.
- Give the band a gentle tug to confirm both sides are locked in place.
No screwdrivers, no spring-bar tool, no risk of scratching the case. If a band ever feels stiff on the first fit, that's normal for a new strap and it settles quickly.
Complete Your Vivoactive 4S Setup
A fresh band is usually the first upgrade, but the two accessories below solve the other everyday annoyances 4S owners run into:
- Garmin Vivoactive 4S Charger & Data Cable Replacement — a spare cable for the office drawer, travel bag or bedside table means a flat battery never costs you a night of sleep tracking. It handles data sync as well as charging.
- Refuel Garmin Vivoactive 4S Watch Charger Stand — an upright charging dock that gives your watch a proper home on the nightstand or desk instead of leaving it dangling off a loose cable.
Why Buy Your Vivoactive 4S Bands From Mobile Mob?
Mobile Mob is Australian owned and operated, run from Melbourne, and we personally pack and send every order the same day. There's no overseas warehouse and no offshore support queue; when you have a question, you're talking to the people who shipped your parcel. Every purchase is also covered by our 30-day change of mind guarantee, so if a colour doesn't suit once it's on your wrist, swapping it is simple. We position our range as the premium-value alternative to genuine Garmin accessories: the same fit and finish where it counts, at a price that makes owning two or three bands realistic.
Garmin Vivoactive 4S Bands: FAQs
How do I know if my watch is a Vivoactive 4S and not a Vivoactive 4?
Check the engraving on the case back or open the Garmin Connect app, where your exact model name is shown on the device page. The 4S has a 40mm case and takes 18mm bands; the standard Vivoactive 4 has a 45mm case and takes 22mm bands. If you own the larger watch, shop the Vivoactive 4 bands collection instead.
What band size does the Garmin Vivoactive 4S use?
The Vivoactive 4S uses 18mm quick-release bands, as confirmed in Garmin's official owner's manual. All straps in our Vivoactive 4S collection are made to this spec.
Do I need tools to change the band?
No. The quick-release spring bar has a small sliding pin you operate with a fingernail. The full swap takes under a minute.
Will these bands fit both men's and women's wrists?
Yes. The strap adjusts across a wide range of wrist sizes using a standard pin buckle, so you set the exact fit yourself. The 4S was designed as the smaller watch in the range, and the band proportions match the 40mm case.
How do I clean my silicone Vivoactive 4S band?
Wipe it down with a damp cloth and a little mild soap, then dry it before putting the watch back on. A quick clean after sweaty workouts keeps the silicone in top condition and prevents skin irritation.
How fast is delivery within Australia?
Orders are dispatched the same day from our Melbourne base. Because we ship domestically rather than from overseas, delivery is fast and tracking works properly from door to door.