Unreleased · Launching Fall 2025
Know
your
body.
Wear
almost
nothing.
ARC is a titanium ring that reads your sleep, heart rate, and recovery — then gets out of the way. 2.9 grams. Seven days of battery. No screen, no noise.
From $299 — final pricing at launch
01 — The object
Drag to rotate ↺
Machined from a single billet of grade-5 titanium.
No seams. No buttons. The sensors live inside the wall — 0.9 mm of instrumentation you will never feel.
02 — Three signals. Nothing else.
Sleep
Your night, decoded to the minute.
ARC stages your sleep — deep, REM, light — from heart rate, temperature, and micro-movement. You wake to one number and a plain-language read of what your body did while you were gone.
Readiness
Train hard. Or don't. ARC will tell you which.
Every morning, resting heart rate and HRV are weighed against your baseline. A single readiness score says whether today is for pushing — or for backing off before your body forces the issue.
Battery
Charge it on Sunday. Forget it exists.
Seven days per charge, measured — not marketed. The wireless puck refills ARC in under 90 minutes. A device you wear every night can't ask for attention every night.
03 — Specifications
A note on proof
ARC is unreleased. So there are no reviews on this page — because none exist yet.
No borrowed star ratings, no "as seen in," no testimonials written before a single unit has shipped. What we have is engineering: 14 hardware revisions, 61 nights of internal sensor validation, and a fall ship date we intend to keep. Judge us at launch.
04 — Questions
Before you ask.
How does sizing work?
Every waitlist reservation includes a free sizing kit, shipped before your ring. ARC comes in sizes 6–13. Wear the sizer for a full day — fingers change size overnight — then confirm your fit in the app.
When does ARC ship?
First units ship this fall, in waitlist order. Joining the waitlist is free and carries no obligation — you'll get an invitation to purchase before public availability, and you can pass on it.
Which phones is it compatible with?
The ARC app supports iOS 16+ and Android 12+. The ring syncs over Bluetooth LE and stores up to two weeks of data on-device, so it keeps recording even when your phone isn't around.
Is there a subscription?
No. Sleep, readiness, and heart-rate insights are included with the ring. We charge for hardware, once.
Can I swim and shower with it?
Yes. ARC is waterproof to 100 meters. Shower, swim, sauna — the titanium doesn't care.
05 — Reserve your place
First run. First served.
The initial production run is limited. Waitlist members get first access, launch pricing, and a free sizing kit. No spam — a handful of emails between now and launch.
You're on the list.
We'll write to you before anyone else can order. Watch your inbox this fall.