Tread Labs has partnered with Flex to allow you to use your Health Savings Account (HSA) or Flexible Spending Account (FSA). This means you can now use your HSA or FSA debit card to buy our products with pre-tax dollars, resulting in net savings of 30-40%, depending on your tax bracket.

To use your HSA or FSA debit card, add products to your cart as usual. At checkout, select “Flex | Pay with HSA/FSA” as your payment option, enter your HSA or FSA debit card, and complete your checkout as usual. If you don’t see “Flex | Pay with HSA/FSA,” you may be in Shop Pay. Select “checkout as guest” to view more payment options.

If you don’t have your HSA or FSA card handy, still select “Flex | Pay with HSA/FSA” as your payment method. Enter your credit card information and Flex will email you an itemized receipt to submit for reimbursement.

HSA/FSA cards are debit cards, and the most common reason for declines is insufficient funds. Please reach out to your HSA/FSA administrator to confirm your balance.

No, unfortunately, this isn't a supported feature right now. If there are insufficient funds in a single HSA or FSA account, you can instead enter a credit card on the Flex checkout page. You will receive an itemized receipt and/or Letter of Medical Necessity from Flex, which you can submit for reimbursement.

If you were prompted to enter a verification code when logging in or at checkout, you’re likely using ShopPay.

ShopPay is Shopify’s express checkout option that lets you use your saved profile information across any Shopify-powered store. It speeds up the checkout process by skipping most of the standard steps.

Want to Use Your HSA/FSA with Flex?

If you’d prefer to check out using Flex to apply your HSA or FSA card, you’ll need to exit ShopPay. Here’s how:

1. On the ShopPay screen, scroll to the bottom.
2. Select “Check out as guest.”
3. This will redirect you to the standard checkout process, where you can select Flex as your payment method.

A letter is essentially a note from a doctor stating that you are purchasing an item to treat or manage a medical condition. More details can be found here.

In order to qualify to use your HSA or FSA card for Tread Labs Sandals and Shoes, the IRS requires you to have a Letter of Medical Necessity. Tread Labs has partnered with Flex to enable asynchronous telehealth visits as part of our checkout. Within 24 hours of your purchase, Flex will email you both a Letter of Medical Necessity and an itemized receipt.

You should keep it on file for at least three years in the event of an IRS audit of your HSA or FSA account. Occasionally, FSAs may ask for the Letter to confirm the eligibility of your purchase.

Tread Labs insoles and top covers are eligible for HSA/FSA without a letter of medical necessity; sandals and shoes are eligible for HSA/FSA only with letter of medical necessity.

Sales tax for eligible items is also covered by HSA/FSA funds. If the customer has a split cart, the tax will be divided among the cards based on the items.