Whoop Bands Size Chart
Whoop does not size its bands the way a shoe or a t shirt is sized. The standard wrist band is a single adjustable size built to fit most adult wrists, while the bicep band (worn higher on the arm for gym sessions or sports where a wrist strap gets in the way) comes in two sizes based on arm circumference. There is no universal "S, M, L" run across every Whoop product, so match the band type to the measurement below rather than guessing from a T shirt size.
Wrist Band (Whoop 5.0, Whoop MG)
| Band Type |
Fit |
Length |
Wrist Circumference |
| Standard Wrist Band |
One Size |
9.5 in / 24 cm |
Fits most adult wrists, roughly 13 cm to 20 cm |
(Source: WHOOP brand sizing guide)
The wrist band is designed to sit a finger's width looser than a watch, snug enough that the sensor stays flush against the skin but not tight enough to leave a mark. If you are between a snug and loose fit, wear it one notch looser rather than tighter, a band worn too tight can actually throw off heart rate readings.
Bicep Band (Whoop 5.0, Whoop MG)
| Size |
Arm Circumference (Inches) |
Arm Circumference (CM) |
| S/M |
Up to 12 in |
Up to 30.5 cm |
| L/XL |
Up to 17 in |
Up to 43.2 cm |
(Source: WHOOP official bicep band sizing guide)
Measure around the widest part of your upper arm with a soft tape, roughly where the band will actually sit. If your reading lands close to 12 inches, size up to L/XL rather than down, the bicep band needs a little give to move with the muscle during a workout.
What Kicks Machine Actually Stocks
Kicks Machine currently carries the Whoop 5.0 and Whoop MG wrist bands in the one size fit that Whoop ships as standard, including the Whoop 5.0 Coreknit Royal Blue Band, the Whoop 5.0 Coreknit Jet Black Band, and the Whoop 5.0 MG Life Sportflex Rush Band. For the bicep band, the Whoop 5.0 Coreknit Ash Grey Bicep Band is listed with both S/M and L/XL selectable at checkout, so buyers get the full official range on that one, not a narrowed subset. Browse the complete lineup in the Whoop collection or the Whoop Straps collection if you are just replacing a band on a device you already own.
If you already own a Whoop 5.0 or Whoop MG sensor and only need a fresh strap, the strap only listings above drop the sensor and subscription cost entirely, you are just paying for the band.
Frequently Asked Questions
Is the Whoop wrist band adjustable, or is it a fixed loop?
It is a fixed loop sized to one length (9.5 in / 24 cm), not a buckle you tighten like a regular watch strap. The knit fabric has a little natural stretch, which is what lets one size fit most adult wrists comfortably. If your wrist sits well outside that range, the bicep band is the better fit, see the table above.
Do the Whoop 5.0 and Whoop MG bands use the same sizing?
Yes. Both devices share the same band mounting, so a wrist band or bicep band from either line fits either sensor. The [Whoop 5.0 MG Life Sportflex Rush Band](https://www.kicksmachine.com/products/whoop-50-mg-life-sportflex-rush-band-only-strap-sale) is even sold as one listing with a size selector for Whoop 5.0 Peak or Whoop MG Life, so you pick your device, not a different band size.
How do I know if I need the bicep band instead of the wrist band?
Choose the bicep band if you play a contact sport, lift heavy, or find a wrist strap slides down during a workout. It sits higher on the upper arm and comes in S/M and L/XL so it stays snug against a larger muscle group. Check the [Whoop 5.0 Coreknit Ash Grey Bicep Band](https://www.kicksmachine.com/products/whoop-50-coreknit-ash-grey-bicep-band-only-strap-sale) for both sizes in one listing.
What happens if my Whoop band is too loose?
A loose band is the most common reason for inconsistent heart rate or sleep data, the sensor needs steady skin contact to read accurately. If the standard wrist band still feels loose after wearing it a finger's width from a watch fit, try the S/M bicep band on the forearm instead, some buyers with smaller wrists prefer that fit for daytime wear.
Can I buy just a replacement Whoop band without the sensor?
Yes. Every band listed on this page, including the [Whoop 5.0 Coreknit Jet Black Band](https://www.kicksmachine.com/products/whoop-50-coreknit-jet-black-band-only-strap-sale), is sold as a strap only item, the sensor is purchased separately if you do not already own one. This is the cheapest way to refresh the look of a Whoop you already have.
Are Whoop bands bought from Kicks Machine genuine?
Every Whoop listing on Kicks Machine goes through the same authentication check applied to the rest of the catalog before it ships, and cash on delivery is available if you would rather pay when the band arrives than upfront. Browse the full range in the [Whoop collection](https://www.kicksmachine.com/collections/whoop) before you order.
