The WHOOP CoreKnit Bicep Band lets you wear your WHOOP on your upper arm, freeing your wrist for a watch or bracelet.L/XL size - fits bicep circumferences between 10 and 13â€Fast Link technology - tightens or loosens the band easilyLightweight design - weighs just 15 gClasp closureCompatible with all WHOOP models (sold separately)