The Apple Watch Ultra 4 arrived in September 2026 with the same 49mm titanium case as the Ultra, Ultra 2 and Ultra 3, now in natural and black titanium, and with the band connector untouched. That is the most useful thing to know about it: every band OzStraps sells in the "44/45/46/49" size fits the Ultra 4, and so does every band you already own from an earlier Ultra. The Silicone Sports band and Ocean band suit the watch's outdoor brief, the Black Milanese Loop dresses it for work, and everything ships from Australian stock with a 12-month local warranty and a satisfaction guarantee.
Upgrading From an Ultra 3, Ultra 2 or Ultra?
Keep your bands. All four Ultra generations share the 49mm case and the same slide-in connector, so a band that fit your Ultra 3 fits the Ultra 4 the same way. The only bands that will not fit are the "40/41/42" size made for the smaller Apple Watch cases. Bands from a 44mm, 45mm or 46mm Series watch are fine too, because they belong to the same "44/45/46/49" family; if you are coming to the Ultra from a 42mm or smaller Series watch, you will need the larger size. The Apple Watch Band Compatibility Guide has the full size table.
What Changed on the Ultra 4
The Ultra 4 upgrades the heart rate sensor for continuous measurement, adds a daily readiness score, and lifts battery life to around 50 hours of everyday use or 84 hours in Low Power Mode, with a 15-minute top-up good for roughly 18 hours. None of that touches the case or the lugs. The one thing to keep in mind is the Ultra's raised, more pronounced lug design compared with a standard Apple Watch: structured bands such as stainless steel bracelets sit slightly differently against it, so check the product photos and reviews on any metal band before ordering.
Best Bands for the Ultra 4 by Activity
- Trail, surf and multi-day use: the Silicone Sports band, the Ocean band made for water, and the D Buckle Sport band for a more secure closure.
- Running and gym: the Nylon Loop or Braided Solo Loop, both light and breathable with no buckle to dig in.
- Work and evenings: the Black Milanese Loop, Classic Stainless Steel or the Single Tour Leather band.
- Something different: the Carbon Fibre Leather band pairs well with the black titanium Ultra 4, and the Magnetic Loop adjusts without a buckle at all.
- Travel: the band storage case or travel storage case keeps spare bands flat in a bag.
Prefer to browse by material? The Ultra 4 range is split into silicone, sport, nylon and scrunchie, Milanese Loop, stainless steel and leather, with protection and storage cases alongside. Pick the "44/45/46/49" size on any of them.
Frequently Asked Questions
What size bands does the Apple Watch Ultra 4 need?
The "44/45/46/49" size. The Ultra 4 keeps the 49mm case used by every Ultra so far, and bands sized "40/41/42" are too small to fit.
Will my Ultra 3 bands fit the Ultra 4?
Yes. The Ultra 4 uses the same 49mm case and the same band connector as the Ultra 3, Ultra 2 and original Ultra, so every band from an earlier Ultra carries over.
Do Apple Watch Series 12 (46mm) bands fit the Ultra 4?
Yes. Bands for the 44mm, 45mm and 46mm Series watches are the same "44/45/46/49" size as the Ultra 4, so they fit; bands for the 42mm Series 12 do not.
Do the bands fit both the natural and black titanium Ultra 4?
Yes. The two finishes share the same case, so every band on this page fits either; the finish only changes which colours look best alongside it.
Is there anything different about fitting bands to an Ultra?
The connector is standard, but the Ultra's lugs are more pronounced than a Series watch's, so structured bands such as stainless steel bracelets can sit slightly differently against the case. Check the product photos and reviews on metal bands before ordering; silicone, nylon and leather bands are unaffected.
What's new on the Apple Watch Ultra 4?
Upgraded heart rate sensing with continuous measurements, a daily readiness score, and longer battery life of up to 50 hours of everyday use or 84 hours in Low Power Mode, with fast charging that delivers around 18 hours from a 15-minute top-up. It comes in natural and black titanium. The case size and band connector are unchanged from the Ultra 3.
How do I change the band on my Ultra 4?
Press the release button on the back of the case, slide the old band out, then slide the new band in until it clicks. No tools are needed, and the band-changing guide shows each step.
Do you ship Australia-wide?
Yes. Orders ship via Australia Post to every state and territory, with free shipping on orders over $30 and same-day dispatch for weekday orders placed before 1pm.
What warranty and returns apply?
Every band carries a 12-month local warranty plus a satisfaction guarantee. Contact sales@ozstraps.com.au for warranty claims, or see the Returns Policy for exchange and refund conditions.
Are these official Apple bands?
No. These are compatible third-party replacement bands made to fit Apple Watch, selected against OzStraps' own quality standards and covered by the 12-month warranty.
Why Shop with OzStraps?
- 12-month local warranty on every band, handled in Australia.
- Satisfaction guarantee with straightforward exchanges and refunds.
- Same-day dispatch on weekday orders placed before 1pm.
- Free shipping over $30 via tracked AusPost delivery.
- Local Australian stock for faster delivery than overseas sellers.