Dress for the run,not just the forecast.
Tell Layer the effort of your run. It reads the shifting weather and dials your layers to both.
SEE HOW IT WORKSHow it works
It learns from your runs, not just the sky.
At launchLayer reads your Strava effort and heart rate, so the recommendation reflects how you run — and sharpens every time you head out.
It anticipates, not just reports.
It accounts for how conditions shift during your run and how hard you plan to go, then settles on one call. No dashboards, no factors to decode.
It's on your wrist.
At launchA glance at your watch before you head out, and a Live Activity while you run. The recommendation is there when the decision is.
See it adapt
One engine. Every forecast.
The same call, re-resolved for the day in front of you — colder, warmer, wetter, windier. This is the real recommendation, not a mock.
Why Layer
It reads you, not just the forecast.
Effort-aware, not just weather-aware
Pace lies; effort doesn't. Layer leans on heart rate and relative effort, so an easy long run and a hard tempo get dressed differently.
Tuned to the whole run
Conditions rarely hold for an hour. Layer reads the shift — cooling later, wind early, rain entering mid-run — and dresses you for the run you're about to do.
One decisive call
No score to interpret, no toggles to weigh. Just what to wear, stated plainly — the way a coach would tell you.
It gets to know you
Tell it once that you ran warm, and it remembers. Personalization you can feel, working quietly in the background.
Personalize for your effort
At launchIt learns from how you actually run.
Connect Strava and Layer reads the runs you already log, so the call reflects your effort, not just the forecast. It works from your first run, and sharpens the moment you connect.
What it reads
Your effort intensity, long vs short sessions, elevation, and recovery patterns, from the runs you already log.
What you get
Dressed for how you actually run, and a little sharper every time out.
Read-only
Layer only reads your effort and heart rate to improve your recommendations. We never post.
Whatever the sky does next, you left the house ready for it.
Why it’s different
The free apps dress everyone the same from the forecast. Layer is the only one that learns from how hard you actually ran.
“I built Layer because I was tired of standing at the door, second-guessing a jacket. It should just know.”
— Building Layer in the openJoin 300+ runners getting early access.
Once you’re moving, your body runs 15-20°F warmerthan the air. What you dress for isn’t what the thermometer says.
Common running guidelineFAQ
Good questions.
Weather apps tell you what it is. Layer tells you what it means for you — dressing you for your effort and how the conditions change mid-run. At launch, connect Strava and it sharpens to how you actually run.
It runs in any browser today. The iPhone app and Apple Watch arrive at launch: a glance before you head out, plus a Live Activity while you run.
The web app runs in any browser today, free, with no account. The iPhone and Apple Watch apps come next — join the list and we'll tell you when they land. Pricing will be settled before then.
Join the waitlist
Dress for the run, not just the forecast.
Layer runs in your browser today. The iPhone app comes next.
No spam. One email, when the iPhone app is ready.