You can now pay for Polsen with your HSA or FSA card at checkout, through Flex. No claim forms and no waiting.

Starting today, customers in the US can check out using Flex, the HSA/FSA platform trusted by 1,000+ wellness brands such as Ultrahuman, Therabody, Equinox, and Hyperice.
Flex makes it possible to use the health benefits you already have easily at our checkout. By paying with pre-tax dollars, your real cost could drop by up to 30%, depending on your tax bracket.
Every watch and strap on the Polsen website is eligible, and because our app has no subscription so there are no strings attached. Other wearables may require you to pay for ongoing out of pocket fees but with Polsen, it’s just one purchase and you’re set for life
Just like most trackers, we track your steps, sleep and activity, but there's something that makes our tracking special: Polsen watches read your body every second, meaning we can show you a minute-by-minute timeline of how your body is responding to daily demands.
So what does that mean for you? Day to day, this timeline reveals how your body is allocating its resources. From seeing which events put your body on high alert, to what habits help you return to baseline, these insights help you understand where you're using your energy.
In the long term, this also helps you understand when your body is overusing its stress response. By combining our unique stress recovery metric with stress duration and stress frequency, we give you a comprehensive picture of your stress response, and can track when this overuse looks like it is building up to something scientists call allostatic load.
When it comes to your health, the causes of your symptoms can sometimes feel shrouded in mystery. Maybe you sleep eight hours and still wake up tired, or a dull headache lingers for no obvious reason. Often, these little things shared a common thread: allostatic load, something a surprising amount of people haven’t heard of. This is the cumulative wear and tear of adapting to stress again and again. Research associates higher allostatic load with poorer long-term health outcomes. And because that load builds gradually, you can live with chronic stress without noticing, especially once it starts to feel normal.
Two of the most effective buffers against stress are sleep and movement. According to the CDC, adults should get at least seven hours of sleep a night, yet more than a third of US adults regularly fall short. For movement, , roughly a brisk 30-minute walk five days a week.

The catch is that stress tends to chip away at both. When it builds, sleep often suffers and motivation to stay active drops, which leaves you less equipped to handle the next wave of stress. That’s why consistency matters more than any single great night’s sleep or standout workout. Tracking your habits over weeks, not days, is what reveals the real pattern
Our trackers are built to support your health awareness in an integral, everyday way. Here’s how:
Awareness is where better everyday habits and decisions start, and this includes choosing to invest in a healthier future with your health dollars.
Here’s a quick breakdown of how these two tax-free accounts differ:
HSA (Health Savings Account): A personal account, funded pre-tax, that grows and is spent tax-free. It belongs to you and rolls over every year, even if you change jobs.
FSA (Flexible Spending Account): Employer-run and funded pre-tax. Unused funds are generally forfeited at the plan deadline, generally by December 31, though some plans offer a grace period into January.
Either way, paying with pre-tax dollars can lower your real cost , and whether open enrollment is coming up or your FSA deadline is approaching, it’s always worth checking what’s sitting in your account.
If you don’t have enough on your card to cover the full amount or would like to combine it with another payment method, you can choose to split payment between your HSA/FSA card and another card at checkout.
What’s an HSA or FSA? Both let you set aside pre-tax money for qualified health expenses. An HSA is a personal account you keep; an FSA is run through your employer and typically has to be used within the plan year.
Is every Polsen watch HSA/FSA eligible? Yes!
What if my card is declined? Try a different HSA/FSA card, or split the payment with another card. If it still doesn’t work, your plan administrator can confirm what your plan covers.
Can I split payment? Yes, use your HSA/FSA card for part of the order and another card for the rest, all in one checkout.
What happens if I send something back? Returns are refunded to the original payment method(s), in the same proportions you used to pay.
Shop Polsen with your HSA/FSA
Ready to use the health dollars you’ve already set aside? Shop Polsen with your HSA/FSA.
DISCLAIMER: HSA/FSA eligibility and savings vary based on individual circumstances and plan rules. Polsen is not intended to diagnose, treat, cure, or prevent any disease.