WHOOP bicep straps for upper-arm wear
WHOOP bicep straps give you a dedicated way to wear the device on your upper arm. This collection includes extended nylon straps for WHOOP 5.0 and MG, with two textures to choose from. They use the newer device fitting and do not fit WHOOP 4.0. Start with that compatibility check, then compare the construction and sizing information.
Braxen or Brelven: compare the two designs
Braxen woven nylon
Braxen has a woven nylon strap with an advertised length of 420mm. An adjustable metal clasp lets you set the fit, and a purpose-built metal case holds the device. Its Black, Grey and Green options offer a straightforward choice of colours if you prefer a woven finish for upper-arm wear.
Brelven braided nylon
The Brelven bicep strap uses a braided woven texture and an advertised 40cm, or 400mm, strap length. It also combines an adjustable metal clasp with a purpose-built device case. This is the extended upper-arm version: the Brelven 220mm wrist strap elsewhere in the range is a separate product with a different intended placement.
Measure your arm without mistaking strap length for fit
Use a flexible tape around the area where you intend to place the strap. WHOOP's guidance places a bicep strap around the thickest part of the upper arm, with the sensor against the skin. Compare your measurement with a confirmed wearable size range when one is provided on the product page.
The 400mm and 420mm figures describe the advertised strap lengths. They do not establish maximum arm circumferences, because the device case, fastening and strap overlap affect the usable fit. A longer published strap measurement alone is not enough to confirm that one product will fit your arm better.
Check the position before you start moving
Seat the device fully in the case, adjust the clasp and check that the sensor rests flat against your skin. The strap should feel secure without excessive tightness. Move your arm through its usual range and check the fit again; do not keep tightening a slipping or poorly seated strap to compensate for the wrong placement.
A WHOOP arm strap is a choice of wear position. It does not, by itself, establish that readings will be better for a particular sport. Choose it because the upper-arm placement suits how you want to wear the device, and follow the device maker's placement guidance.
Care for the fabric and hardware
Follow the product's cleaning instructions, remove perspiration after wear and allow the nylon and your skin to dry before refitting. Inspect the clasp and device case when changing straps. For wrist styles in silicone, nylon or metal mesh, explore all WHOOP straps, or browse by device in the WHOOP 5.0 and WHOOP MG collections.
