A research-driven wearable concept that reads your body's stress signals and responds with precision-dosed scent — calm delivered at the moment you need it most.
Polarmain is a speculative product concept born from a simple question: what if your body could trigger its own aromatherapy? The device is a wearable diffusion necklace that monitors heart-rate variability (HRV) as a proxy for stress state, and responds by releasing a calibrated micro-dose of therapeutic scent — privately, precisely, and exactly when the body signals that it needs support.
Unlike traditional diffusers, which broadcast scent into an environment indiscriminately, Polarmain is personal and responsive. The wearer decides the scent profile; the device decides the moment.
This project was treated as a serious early-stage product exploration from day one — not a sketch exercise, but a disciplined research process involving expert consultation, safety review, and iterative concept refinement grounded in real engineering and aromatherapy constraints.
The research phase was extensive and interdisciplinary — each domain surfacing constraints, opportunities, and design requirements that directly shaped the concept.
Established safe dosage thresholds for skin-proximate diffusion, dermal absorption risks, and which essential oil categories are appropriate for continuous low-level exposure.
Studied the neuroscience of smell — how quickly scent molecules reach the limbic system, the role of habituation, and how scent fatigue affects therapeutic efficacy over time.
HRV is a validated biomarker for autonomic nervous system state. Research identified minimum sensor accuracy requirements and established HRV thresholds that would trigger a diffusion event.
Evaluated optical PPG sensors for HRV measurement at the necklace position (sternal or clavicular), assessing accuracy tradeoffs versus wrist-based measurement.
Framed the product within evidence-based emotional regulation frameworks — understanding when scent intervention is helpful, and when it risks masking rather than addressing stress.
Defined hard constraints from the research: maximum diffusion duration, minimum inter-diffusion intervals, cartridge isolation requirements, and skin-safe material specifications.
Three expert domains were consulted to pressure-test the concept against real-world engineering and safety constraints.
Consulted on miniaturization constraints for the diffusion mechanism, power budgeting for a coin-cell battery system, and the viability of micro-pump or piezoelectric diffusion at the required dosage scale.
Advised on scent selection for stress modulation, session duration recommendations, and how to structure a cartridge system that supports genuine therapeutic outcome rather than preference alone.
Evaluated sensor placement, signal quality at non-wrist body positions, real-time HRV computation requirements, and the edge-processing needed to make biometric-triggered diffusion responsive without latency.
The pendant is designed to be compact enough to wear as jewelry, with all active components housed within a form factor no larger than a standard pendant locket. The architecture is deliberately modular — the scent cartridge is user-replaceable, the sensor module is calibratable, and the interface is minimal by design.
Proximity to the nose matters for olfactory efficacy. A pendant sits 20–30cm from the nasal passage — close enough for targeted delivery while avoiding skin-contact diffusion risks. A wristband would require significantly higher scent intensity to achieve equivalent effect.
User-initiated diffusion exists as a fallback mode, but the primary interaction is biometric. Removing the manual decision from the loop addresses the core UX problem: people under stress often don't realize they need support until after the moment has passed.
Rather than a fixed reservoir, Polarmain uses a cartridge-based system. This enables scent personalization, prevents cross-contamination between blends, and creates a sustainable business model aligned with the therapeutic protocol (rotating scent to prevent habituation).
The device surface exposes a single mode button and one status light. All configuration — scent scheduling, HRV sensitivity, diffusion duration — happens in a companion app. The pendant itself should disappear into the wearer's day.
The most interesting design problems live at the edge of what's technically possible and what a person's body actually needs.
Polarmain pushed me to design for constraint — where the body's safety requirements, engineering minimums, and therapeutic protocols all had to coexist within something small enough to wear as jewelry. That tension between precision and warmth, between clinical rigor and personal meaning, is exactly where I want to keep working.