A wearable gear for holding a physiological sensor for monitoring a subject, the wearable gear comprising: a tensioning element having a maximal length and a holding unit for holding the physiological sensor characterized in that: the wearable gear further comprises a tension mechanism for tensioning the tensioning element to a predefined tension when at least partially around a body part of the subject, wherein the tension mechanism comprises i) a first part comprising a resilient material, and ii) a second part comprising a non-resilient material and wherein the first part and the second part mechanically cooperate with each other to automatically adjust the maximal length such that the predefined tension is obtained regardless of the size of the body part.
