Turn your Apple Watch into an armband with ActionSleeve

The Apple Watch's heart rate monitor is one of the most accurate options on the oximeter market — as long as you're not doing anything that involves wrist bending or heavy protective gear. Now, Twelve South (opens in new tab) may have just the armband strap to fix that problem.

To understand why the Apple Watch doesn't like it when you bend your wrist, you have to get how the device's heart rate sensor (oximeter) works. Essentially, the Apple Watch measures your pulse by shining light on the blood vessels in your wrist and measuring how fast blood pumps through said vessels. When you bend your wrist or otherwise contract muscles in your arm, however, the watch may not get an accurate reading thanks to those vessels being constricted. Things like pushups, other weightlifting, and even roller derby can interfere with how the monitor reads your pulse — leading to inaccurate workouts.

But rather than pick up a third party armband heart rate monitor to augment your Apple Watch, Twelve South has a different option for exercise aficionados: Move your watch to your bicep with its new ActionSleeve Armband strap.

The strap comes with a protective silicone outer frame to protect your watch's casing and an adjustable neoprene strap to provide a snug fit on your arm — no matter your flexing prowess.

It's also a great option for amputees and other athletes who don't always have access to their wrists — Twelve South worked with Cameron Massengale, an amputee athlete at The Citadel Military College of South Carolina (opens in new tab), when developing the product.

I've consistently worn my Apple Watch under my wrist guard during roller derby in the years I've owned it, but Twelve South's new ActionSleeve has me very excited nonetheless — wearing the watch under protective gear is often uncomfortable, and I don't have easy access to the controls. (I even took to wearing it in Reverse Crown orientation so the crown wouldn't push against the wrist guard.) I already swap my straps when I go to exercise; swapping for an armband seems like an even better idea.

What about you, iMore? Sound like something you want to try for your Apple Watch? Let me know in the comments.

See at Twelve South (opens in new tab)

Serenity was formerly the Managing Editor at iMore, and now works for Apple. She's been talking, writing about, and tinkering with Apple products since she was old enough to double-click. In her spare time, she sketches, sings, and in her secret superhero life, plays roller derby. Follow her on Twitter @settern.

5 Comments
  • Hope this is available in the UK as it would help whilst doing kettle bell and light weighs workouts.
  • We will ship from the US now and it will be available in the UK on Amazon in the next couple of months. Thanks!
  • I'd love to try this!!! I can't seem to find it on a Apple Store. I'll have to check amazon hopefully they'll have it for shipping to Canada🇨🇦 Sent from the iMore App
  • If you order directly from us we can absolutely ship to Canada (unfortunately Apple is not carrying the ActionSleeve). It will also be on Amazon Canada in the coming months so you can definitely check back. Thanks!
  • Ordered! This is just what I wanted for my ⌚️