AURA Strap 2 review — Add body composition tracking to your Apple Watch
If you want more than heart rate and steps from your Apple Watch, the AURA Strap 2 promises a practical upgrade: track fat, muscle and water levels directly from a watch strap. Priced at $159, it’s aimed at people who care about body composition trends and want that data on their wrist without carrying extra hardware. This review breaks down what it does, how it works day‑to‑day, and whether it’s worth adding to your fitness setup.
What the AURA Strap 2 is (and what it does)
The AURA Strap 2 is a replacement Apple Watch strap with built‑in sensors that measure body composition metrics—body fat, muscle mass and hydration—while you wear your watch. It pairs with the Apple Watch form factor and syncs data to the companion app so you can set goals and track changes over time.
Key selling points at a glance:
- Body composition tracking: Measures fat, muscle and water levels.
- Apple Watch compatibility: Available for 42mm (41/40/38mm) and 46/49mm (45/44/42mm) Apple Watch sizes.
- Style options: Coal Black, Summer Gray, Crimson Red and Navy Blue.
- Price: $159 (current official price).
Key features and real-world benefits
1. Continuous body composition tracking
Unlike scale‑only solutions, the strap lets you capture body composition more frequently and conveniently. That means you can:
- Spot short‑term trends after workouts, travel, or diet changes.
- Measure progress toward specific goals (fat loss, muscle gain, hydration targets).
- Reduce friction—measurements are taken from a device you already wear daily.
2. Integration with Apple Watch
The strap replaces your existing Apple Watch band and keeps your watch functional while adding new sensors. Benefits include:
- Single device workflow—no separate scale to step on or handheld meter to use.
- Data visible on the watch and in a companion app for trend analysis.
3. Practical design and color options
Available in four colors and two Apple Watch size sets, the AURA Strap 2 is designed to match Apple Watch aesthetics. Real-world benefits:
- Multiple colors let you match the strap to daily outfits or workouts.
- Quick swap with the standard Apple Watch connector keeps setup familiar.
Compatibility, setup and daily use
The AURA Strap 2 is sold in two size groups to fit Apple Watch case sizes. Setup is straightforward: attach the strap to your Apple Watch, install the companion app, and follow the in‑app calibration steps to start recording composition data.
For daily use:
- Wear your watch as usual; measurements are collected when the strap detects proper contact and signal quality.
- Open the app to view fat, muscle and water trends and to set goals.
- Expect to use it both at rest and after workouts for different insight types—hydration shifts after exercise, muscle changes across training cycles, etc.
Performance and accuracy — what to expect
The strap provides convenient and frequent body composition readings, which is its primary advantage over scale‑only approaches. However, some important points to keep realistic expectations:
- Single‑session readings can vary. Use trends over days and weeks for meaningful insight.
- Factors like skin contact, sweat, and positioning affect readings—consistent wear improves reliability.
- This tool is best for tracking relative changes, not for diagnostic medical use.
In practice, users who log measurements regularly can detect meaningful trends—e.g., a gradual drop in body fat percentage after several weeks of a diet or a rise in muscle mass following a strength program.
Design, comfort and battery
AURA Strap 2 follows the look and feel of modern Apple Watch bands—clean lines, solid build and watch‑centric connectors. The strap is comfortable for all‑day wear and works for both casual and workout use. Multiple size and color options help it fit a wide range of users.
The product listing does not require carrying or charging a separate device—you continue to use your Apple Watch. (Check the official product documentation on setup and any charging/maintenance steps before purchase.)
What’s included and available options
| Model | AURA Strap 2 |
| Price | $159 USD |
| Colors | Coal Black, Summer Gray, Crimson Red, Navy Blue |
| Apple Watch sizes | 42mm (fits 41/40/38mm) and 46/49mm (fits 45/44/42mm) |
Pros and cons — quick summary
- Pros: Convenient on‑wrist composition tracking; Apple Watch integration; attractive design; frequent measurements for trends.
- Cons: Single readings can vary (trend analysis recommended); not a medical device; some color/size variants may be temporarily out of stock.
The AURA Strap 2 is a practical tool for anyone who wants ongoing insight into body composition without adding another gadget to their routine.
Final verdict — who should buy the AURA Strap 2
If you regularly use an Apple Watch and want to track fat, muscle and hydration trends more conveniently than stepping on a scale, the AURA Strap 2 is a strong option. It’s particularly useful for:
- Fitness enthusiasts tracking training progress (muscle gain, fat loss).
- People who prefer on‑wrist convenience over separate measurement devices.
- Anyone who values trend data and wants to pair composition metrics with daily activity and workouts.
Consider other options if:
- You need clinical‑grade diagnostics—this is a consumer tracking tool intended for trends, not medical decisions.
- You rarely wear an Apple Watch or prefer to use a scale for body composition checks.
Bottom line: For $159, AURA Strap 2 delivers useful, easy-to-access body composition tracking on your Apple Watch. It won’t replace clinical testing, but for tracking trends, staying motivated, and getting extra insight from the watch you already wear, it’s worth considering.
Availability and color/size stock can vary. Check the official AURA Devices product page or retailer listing for the latest availability and model options.
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