The Application dimension of Biosensor Underwear segmentation isolates four principal use‑cases: health monitoring, sports performance, elderly care, and infant monitoring. Health monitoring—encompassing continuous glucose, hydration, and vital‑sign tracking—captures the largest share, roughly 45 % of total revenue, driven by chronic‑disease management programs and payer‑backed adoption. Sports performance, accounting for about 25 %, focuses on real‑time lactate, muscle‑oxygen, and biomechanical metrics that inform training regimens for elite and recreational athletes. Elderly care contributes an estimated 20 % as aging populations prioritize fall‑risk detection, urinary‑incontinence alerts, and early‑warning cardiac signals integrated with remote‑care platforms. Infant monitoring, though a niche at 10 %, leverages non‑invasive temperature and respiration sensors to reduce sudden‑infant‑death‑syndrome risk. Each application segment shapes distinct supply‑chain requirements, pricing tiers, and regulatory pathways, collectively defining the market’s overall size and growth trajectory.