Ascendra One · Ex Astris
Ascendra One is a sensing garment that measures heat across your torso and how your spine actually moves, then turns both into coaching you can act on mid-session.
$99 today
$350 before it ships · $449 total
Estimated ship window: Q2 2027. This is a good-faith estimate, not a guaranteed date. If it moves we will email you and you can cancel for a full refund.
Fully refundable until your unit ships. No cutoff date.
Shipping and tax are calculated at checkout before you pay. Nothing is added afterwards.
The argument
This is not a claim that wrist devices are inaccurate. They are quite good at what they can reach. The point is what they cannot reach - and that is a question of geometry, not engineering. A sensor on your wrist is not touching your torso, and no amount of signal processing fixes that.
01
10 temperature sensors across the garment read heat zone by zone: left against right, upper against lower, where it is pooling and where it is clearing. A single reading is a number. A gradient is a picture.
A wrist device has one sensor, on a limb, downstream of everything that matters. It cannot construct a gradient because it only has one point.
02
3 IMUs distributed along the spine track how each segment is oriented and loaded, and how that changes as a session goes on. Posture is not one angle - it is a chain, and the chain fails unevenly.
A ring or a watch measures the motion of the limb it is strapped to. It has no mechanical connection to your spine, so it has nothing to report about it.
Where this is
Ascendra One is in alpha. 7 hand-assembled units are with a development cohort right now, generating the data the production build is designed around. Pre-ordering puts you in the first manufactured run, not the prototype run.
What you get
Core layer in an 80/20 nylon/spandex fabric with the sensing layer built in, not attached. 10 temperature sensors, 3 spinal IMUs.
Dockable Processing Unit. Nordic nRF52840, 250 mAh, BLE. Carries the 11th temperature sensor, the 4th IMU, and the PPG. Detaches before washing.
Carry the DPU on its own for low-intensity days when you do not want the full garment.
Live streaming and the Aetheris readout. App access is invite-only today; pre-order customers get priority.
01
Pull on the garment and dock the DPU. The sensing layer is part of the garment, not clipped onto it - you stop noticing it in about a minute.
02
The DPU streams over BLE to the iOS app in real time. No pairing ritual, no button to hold down.
03
Aetheris reads the combined thermal, postural and cardiac picture and tells you what it means for this session, while you are still in it.
The ecosystem
Trail shirt for mountain days. Training shirt for the gym. Recovery band for everything else. The sensor hub moves between all of them - the intelligence stays with you, not the garment.
It moves when you move, and disappears when you need it to.
The app
Thermal gradient, spinal load and cardiac data are only useful together. Aetheris combines them into a plain-language readout while you are training, rather than a chart to interpret afterwards.
Being straight with you: the app is in TestFlight and access is invite-only right now. Pre-ordering puts you at the front of that queue - it does not get you in tomorrow.
Yes. The DPU pops out first - it is the only electronic part that has to stay dry. The garment itself is designed to be washed like normal technical apparel.
We have not finished durability testing on wash-cycle count, so we are not going to quote you a number yet. It will appear in the spec table when we have measured it.
S through XL. The garment is a compression fit by necessity - sensors have to stay in contact with skin to read anything, so a loose fit would degrade the data.
If it does not fit when it arrives, send it back within 30 days in original condition for a full refund. Before it ships, you can cancel any time for a full refund regardless.
The DPU carries a 250 mAh battery and updates over the air.
We are not quoting a runtime figure yet. The alpha units are still being measured under real training load, and a battery number that turns out to be optimistic is exactly the kind of thing that makes people feel lied to. It goes in the spec table when it is measured.
Our estimated window is Q2 2027. That is a good-faith estimate for a hardware product still going into production, not a guaranteed date.
If it moves, we email you with the revised window and you can cancel for a full refund at that point. You will not have to chase us for it. Details on the shipping page.
Any time before your unit ships, for any reason, in full. There is no cutoff date and you do not have to give a reason - email [email protected].
After it ships, the standard 30-day return applies. Full terms on the refunds page.
You own it. It is used to give you your readout and coaching, and it is not sold, rented, or licensed to anyone.
You can delete it at any time. If you connect a third-party service like Oura, that data is used only for live coaching and is never used to train models. Full detail in the privacy policy.
No, and we are careful about this. Ascendra One is a performance and wellness garment. It measures physiological signals and helps you train against them. It does not diagnose, treat, cure or prevent any disease, and it has not been validated for clinical or diagnostic use. If something feels medically wrong, talk to a doctor, not a shirt.
Yes. Ascendra One includes the iOS app and Aetheris. App access is currently invite-only while we are in TestFlight, and pre-order customers get priority in the invite queue - see the Aetheris page.
A chest strap gives you a good heart signal from one point. A watch gives you a decent heart signal from your wrist plus motion of your arm.
Neither can tell you where heat is accumulating across your torso, or how your spine is moving segment by segment, because neither is in contact with the surface those signals live on. That is the gap this fills - not accuracy, geometry.
$99 reserves a unit in the first production run. $350 is collected before it ships, $449 total.
Estimated ship window Q2 2027. Fully refundable until your unit ships.
$99 today
$350 before it ships · $449 total
Estimated ship window: Q2 2027. This is a good-faith estimate, not a guaranteed date. If it moves we will email you and you can cancel for a full refund.
Fully refundable until your unit ships. No cutoff date.
Shipping and tax are calculated at checkout before you pay. Nothing is added afterwards.
