Want a slim smartwatch for everyday wear that you barely notice under a shirt cuff or while sleeping — but that still tracks your health properly? Most “slim” smartwatch marketing is relative; REXQU’s Equilibrium is built around an actual number worth knowing before you buy.
What “Slim” Actually Means on a Slim Smartwatch for Everyday Wear
Case thickness on smartwatches is usually described in vague terms — “sleek,” “low-profile” — without a number attached. The REXQU Equilibrium is a metal health watch that measures 7.5mm thick and weighs 45 grams, with a curved 1.96-inch AMOLED display. For comparison, a lot of full-featured smartwatches run closer to 10–12mm, which is enough to catch on a shirt cuff or feel present while you sleep — the two situations where thickness actually matters day to day.
What’s Packed Into the Thin Case
Slimming the case down doesn’t mean REXQU cut sensors to do it. The Equilibrium tracks 24/7 heart rate, blood pressure, and blood oxygen, runs scientific sleep monitoring, and takes Bluetooth calls — all through the free companion app on iPhone and Android, with every feature included permanently and no subscription. It’s priced at $129.97 and comes in six finishes: Black, Gray, and Brown in soft silicone, a two-tone Black Gold, and dressier Black or Silver steel bracelets — all sharing the same sensors and battery.
Why Thickness Matters Most Overnight
A slim smartwatch for everyday wear earns its keep specifically when you’re using sleep tracking, since that’s the one use case where the watch is against your wrist for eight straight hours, often at an angle a thicker case would make uncomfortable. At 7.5mm and 45 grams, the Equilibrium is built to disappear during sleep staging rather than to be noticed and slept around. Consistent tracking matters here too — the CDC’s overview of sleep and health is a good primer on why regular sleep data is worth paying attention to in the first place.
Equilibrium at a Glance
| Spec | REXQU Equilibrium |
|---|---|
| Case thickness | 7.5mm |
| Weight | 45g |
| Display | 1.96″ curved AMOLED |
| Health tracking | Heart rate, blood pressure, SpO₂, sleep staging |
| Calling | Bluetooth calls |
| Finishes | 6 (silicone, steel, two-tone) |
| Price | $129.97 |
Who Should Consider It
If you’ve skipped sleep tracking on a smartwatch before because the case felt too bulky to sleep in comfortably, or you just want something that reads as a normal watch under a sleeve at the office, the Equilibrium’s thickness is the actual reason to pick it over a bulkier health watch with a similar feature list. If Bluetooth-call range or a bigger display matters more to you than case thickness specifically, REXQU’s Meridian and Verve are worth comparing alongside it.
Getting the Fit Right
A slim case still needs the band adjusted correctly to feel invisible. Wear it loose enough to slide a fingertip underneath comfortably during the day, then snug it one notch tighter before bed — a slightly firmer overnight fit keeps the optical heart-rate and SpO₂ sensors making consistent skin contact, which matters more for sleep-stage accuracy than for daytime step counts. If you switch between a silicone and a steel-bracelet finish, expect to re-adjust the fit each time, since the two materials sit differently against the wrist even at the same case size.
Frequently Asked Questions
Is a slim smartwatch for everyday wear less accurate at tracking than a bulkier one? No — the Equilibrium runs the same 24/7 heart rate, blood pressure, SpO₂, and sleep sensors as REXQU’s larger watches; the case was slimmed down around the electronics, not by removing them.
Which finish is most comfortable for sleeping in? The soft-silicone finishes (Black, Gray, Brown) are the most flexible against the wrist overnight. The steel-bracelet finishes look dressier but are a firmer fit, which some people prefer even for sleep tracking.
Do I need a subscription for the health features? No — heart rate, blood pressure, SpO₂, sleep monitoring, calls, and every watch face are included permanently with the Equilibrium.
At 7.5mm, the Equilibrium is one of the more genuinely slim options in REXQU’s lineup rather than just slimmer-looking marketing — worth a look if case thickness has been the actual dealbreaker on every other health watch you’ve tried.