10 Surprising HSA/FSA Eligible Items You Can Buy Online

Yulia Derdemezis

Head of Marketing at Flex

Updated: December 19, 2025

🚀 Fast Facts: What makes an item a “surprising” HSA/FSA eligible purchase

If you’re searching for HSA/FSA eligible items, the reason these products qualify comes down to three core IRS rules:

Devices that measure or monitor health metrics: including sleep, fertility hormones, metabolic data, growth patterns, posture, and recovery
Items used to treat, manage, or prevent a medical condition, from musculoskeletal pain to sleep disorders to mobility challenges
Products that qualify with a Letter of Medical Necessity, making them eligible even if they look like general wellness tools at first glance

These eligibility pathways are why brands like Oura Ring, Mira, Kizik, Lumen, Forme Science, and more offer products that fall under the category of unexpected and surprising HSA/FSA eligible items.

All of the items featured in this guide are available through the Flex Marketplace, the easiest place to shop for pre-tax eligible products across sleep, fitness, women’s health, metabolic health, posture, and more.

If you’re searching for HSA/FSA eligible items, the reason these products qualify comes down to three core IRS rules:

Devices that measure or monitor health metrics: including sleep, fertility hormones, metabolic data, growth patterns, posture, and recovery
Items used to treat, manage, or prevent a medical condition, from musculoskeletal pain to sleep disorders to mobility challenges
Products that qualify with a Letter of Medical Necessity, making them eligible even if they look like general wellness tools at first glance

These eligibility pathways are why brands like Oura Ring, Mira, Kizik, Lumen, Forme Science, and more offer products that fall under the category of unexpected and surprising HSA/FSA eligible items.

If you’re searching for HSA/FSA eligible items, the reason these products qualify comes down to three core IRS rules:

Devices that measure or monitor health metrics: including sleep, fertility hormones, metabolic data, growth patterns, posture, and recovery
Items used to treat, manage, or prevent a medical condition, from musculoskeletal pain to sleep disorders to mobility challenges
Products that qualify with a Letter of Medical Necessity, making them eligible even if they look like general wellness tools at first glance

These eligibility pathways are why brands like Oura Ring, Mira, Kizik, Lumen, Forme Science, and more offer products that fall under the category of unexpected and surprising HSA/FSA eligible items.

If you’re searching for HSA/FSA eligible items, the reason these products qualify comes down to three core IRS rules:

Devices that measure or monitor health metrics: including sleep, fertility hormones, metabolic data, growth patterns, posture, and recovery
Items used to treat, manage, or prevent a medical condition, from musculoskeletal pain to sleep disorders to mobility challenges
Products that qualify with a Letter of Medical Necessity, making them eligible even if they look like general wellness tools at first glance

These eligibility pathways are why brands like Oura Ring, Mira, Kizik, Lumen, Forme Science, and more offer products that fall under the category of unexpected and surprising HSA/FSA eligible items.

Most people think HSAs and FSAs can only be used for prescriptions, doctor visits, or cold medicine. But in 2025 (and now almost 2026), the world of HSA/FSA-eligible products is much broader, especially as health tech, recovery tools, and at-home diagnostics keep evolving.

If you’re trying to avoid the Use-It-Or-Lose-It crunch (or simply want to spend smarter), here are 10 surprising HSA/FSA-eligible items and why they qualify.

10 surprising HSA/FSA eligible products you can buy online

Fitness Products

Product	Description
	The Carry — Weighted Vest for Women What it is: A weighted vest engineered specifically for women, with removable plates and an ergonomic design that supports bone density, posture, mobility, and longevity-focused training. Why it’s eligible: Weighted vests used for improving posture, balance, strength maintenance, or physical-therapy programs are often eligible when tied to bone-health or musculoskeletal treatment.

Women’s Health Products

Product	Description
	Mira — Fertility & Hormone Monitor What it is: A clinical-grade at-home hormone testing system that measures LH, estrogen, and other biomarkers to guide fertility, cycle health, and hormone balance. Why it’s eligible: Mira is a diagnostic medical device, one of the most straightforward IRS-approved HSA/FSA categories.

Sleep Tech

Product	Description
	Oura Ring — Sleep & Readiness Tracking What it is: Oura tracks medical-grade metrics such as HRV, body temperature, sleep stages, stress load, and recovery patterns, giving users a full view of sleep health and early health-change indicators. Why it’s eligible: Oura qualifies as a health-monitoring device that tracks quantifiable metrics used in sleep-health programs and recovery protocols.
	Nanit — Smart Breathing & Sleep Monitoring What it is: A baby-monitoring system that tracks breathing motion, sleep patterns, growth, and health-related insights that help parents support infant wellbeing. Why it’s eligible: Devices that track breathing or sleep irregularities are often classified as medical monitoring tools.
	Ozlo Sleep — Sleep Earbuds What it is: Sleep-improving devices designed to regulate circadian rhythms, address insomnia patterns, support recovery, and reduce stress-related sleep disruption. Why it’s eligible: Sleep-health tools qualify when used to manage insomnia, sleep irregularities, or circadian challenges under a treatment plan.

Metabolic Health & Diagnostics

Product	Description
	Lumen — Metabolic Breath Analyzer What it is: A handheld device that measures your body’s fuel source (fat vs. carbs) to guide nutrition, energy balance, and metabolic flexibility. Why it’s eligible: Lumen is a diagnostic metabolic device, making it eligible when used to manage metabolic conditions or weight-related health goals.
	Hume Health — Metabolic & Behavioral Health Support What it is: A personalized program that helps people improve metabolic function, glucose regulation, weight stability, and long-term health habits. Why it’s eligible: When used to address clinically relevant metabolic conditions, Hume Health may qualify with documentation or an LMN.

Footwear & Apparel

Forme Sciense posture-correcting clothing

Product	Description
	Kizik — Hands-Free Adaptive Footwear What it is: Structured, hands-free shoes designed for easier movement, stability, and accessibility, especially for people with mobility limitations, chronic back pain, joint issues, or post-surgery needs. Why it’s eligible: Adaptive footwear qualifies with an LMN when used to support mobility challenges, orthopedic needs, or chronic pain.
	Forme Science — Posture Correcting Apparel What it is: FDA-registered alignment shirts, bras, and posture gear that retrain upper-body alignment using built-in biofeedback and muscle-engagement technology. Why it’s eligible: Forme functions as posture-correcting medical apparel, a category recognized under HSA/FSA guidelines, especially when used for spinal alignment or chronic pain.