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All Products
Xendurance products are HSA/FSA eligible 
Step 1
Choose Flex Payments at checkout
Step 2
Complete a short survey to confirm eligibility
Step 3
Pay using your HSA/FSA Card. Your order confirmation email includes an invoice that serves as an itemized receipt. A Letter of Medical Necessity (LOMN)View allShop Eligible HSA/FSA Products FAQ
Common questions about HSA/FSA payments, Letters of Medical Necessity, and reimbursements.
What is Flex and what is their relationship with Xendurance?Xendurance 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 Xendurance products with pre-tax dollars, resulting in net savings of 30-40%, depending on your tax bracket.
How do I pay with my HSA or FSA card?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.
What if I don't have my HSA/FSA card available?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.
Why can't I see Flex as a payment method?The key here is to make sure you are logged out of ShopPay. One of the easiest ways to do this is to go through checkout in an incognito window.
Why is my HSA/FSA card being declined?HSA/FSA cards are debit cards, and the most common reason for declines is insufficient funds. Reach out to your HSA/FSA administrator to confirm your balance.
What is a Letter of Medical Necessity?Some products require documentation from a licensed healthcare provider stating that the item is necessary to treat or manage a specific medical condition. If the product requires a Letter of Medical Necessity (LOMN), Flex facilitates a chat-based telehealth consultation that is reviewed by a licensed provider, and typically the Letter is provided within 2 hours.
How to file for HSA/FSA reimbursement?Complete your health consultation: Complete a brief, 2-minute consultation. A licensed provider will review your responses and determine your eligibility. If eligible, you’ll receive a Letter of Medical Necessity within two hours.
Make your Xendurance purchase: Use a standard payment method. Do not use your HSA/FSA card at checkout.
Submit for HSA/FSA reimbursement: Follow Flex’s instructions to submit your Letter and Life Time receipt to your HSA/FSA administrator for reimbursement.
