A stretchable sensor that is integrated into a wearable device (e.g., an in-ear device (IED), a headset, etc.). The sensor is flexible and stretchable and, in the context of an IED, can be embedded within a soft silicone eartip. When the IED is inserted inside the ear-canal, the stretchable sensor automatically adapts to a shape of the ear-canal and retains a good contact with anatomy. Likewise, the sensor could be integrated into, e.g., soft nosepads of a headset. The sensor may be bio-sensor.

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