Engineer-Tested for Every Scenario
Our team doesn’t just test in labs – we live in these headphones. From open-water swims to office marathons, we know one size doesn’t fit all.
That’s why we offer two precision-fit options with identical premium specs for performance.
With hours of testing across oceans, offices (and on our pillows), we found that a length difference of 2.1cm makes all the comfort difference. Our two sizes cover 100% of our surveyed testers with optimal stability, whether you’re coding or doing yoga inversions.
And here is all you need to know to decide which fit is best for you:
The “Data-Scientist” Guide
| Model | Band Length 📏 | Head Circumference 👤 | Recommended For ✅ |
|---|---|---|---|
| Regular | 18.1cm (7.1″) | 50-65cm (19.7-25.6″) | Most adults • Average to larger head sizes |
| Mini | 16cm (6.3″) | 45-55cm (17.7-21.7″) | Teens • Petite adults • Snug-fit preference |
How to Measure:
Two Ways to Find Your Perfect Fit
Method 1: Head Circumference
- Wrap measuring tape around your head (above ears and eyebrows)
- Regular: 50-65cm / Mini: 45-55cm
Method 2: Ear-to-Ear Measurement
- Measure from behind one ear to behind the other
- <25cm? Mini will hug your head like it was custom-made
- ≥25cm? Regular delivers all-day comfort
The Non-Technical Guide / More Information for You to Consider
| If You… | Get Regular | Get Mini |
|---|---|---|
| Wear all-day | ✅ Slightly less clamping force for all-day comfort | ⚠️ Shorter band = firmer fit |
| Have big neck / Are muscular | ✅ comfortable fit – no pressure | ⚠️ May feel tight |
| Are a woman athlete | — | ✅ Proportional to smaller neck circumference (avg. 13.5″) |
| Sleep when listening / travelling | ⚠️ May shift during sleep | ✅ Compact design stays put |
Other Key Points to help you choose:
Regular Rarely Fails:
- 2.1cm extra length eliminates “clamp fatigue” for all-day comfort
- No “hugging” sensation for BIG heads.
- Tested for 50-65cm heads which covers most adults
Mini Wins When You Need:
- Hair-friendly security for ponytails/braids
- Unshakable fit during flips/sprints
- Pillow-friendly low profile
Most Women Athletes Prefer Mini:
- Scaled to average female neck circumference (34.3cm vs. men’s 38.1cm)
- Lighter and closer fit prevents ponytail interference
- 37% more women testers in survey reported “no-adjustment-needed” security during HIIT
Pro Tip: Between sizes? Sweet! Regular offers more flexibility; Mini excels for high-motion activities (and FYI our engineers almost always prefer Mini in this case!).
Note: Need more help choosing? Email support@ampacttech.com for personalised sizing advice.