What Is OOFOS
OOFOS makes recovery footwear for the hours outside your workout. Its range includes the OOriginal thong sandal, OOahh slides, OOcloog clogs, and closed-toe shoes like the lace-up OOmy Stride. Regular prices run from about $60 for the OOriginal sandal and OOahh slide to $120 for the Stride.
The brand describes its OOfoam cushioning and arch-supporting footbed. Those features appear in different shapes: an open sandal leaves your toes and heel uncovered, while a lace-up shoe surrounds the foot with an upper. The shape matters when a tender toe joint or irritated heel needs room.
OOFOS describes its footwear as suitable for casual walking and post-workout recovery. It does not recommend exercise-specific use. Your HSA or FSA pays for a pair when it does a medical job for your feet, beyond feeling good after a workout.
Why OOFOS Qualifies for HSA/FSA
OOFOS footwear qualifies with a Letter of Medical Necessity (LMN) documenting its medical purpose. IRS Publication 502 defines medical expenses around the “diagnosis, cure, mitigation, treatment, or prevention of disease.” When a licensed provider ties your OOFOS to a foot condition in your letter, the pair becomes medical care you can buy with HSA/FSA funds.
A provider can document a footwear need for conditions such as:
- Plantar fasciitis. Cushioning under the heel and support through the arch are relevant to managing plantar heel pain. The American Academy of Orthopaedic Surgeons (AAOS) includes thick soles and extra cushioning among footwear measures for this condition.
- Metatarsalgia. Pain across the ball of the foot can make pressure relief a medical need. Mayo Clinic says arch supports might lessen the stress on the metatarsal bones. OOFOS describes arch support as part of its footbed design.
- Insertional Achilles tendinitis. An open heel leaves the back of the shoe away from the irritated tendon. AAOS includes open-back footwear among ways to reduce that irritation. That applies to the open-back styles, not the lace-up Stride.
- Bunions. Bunion pain often starts where a shoe rubs the bony bump. AAOS recommends a wide or open toe box. An open sandal serves that purpose when its straps also leave the affected joint room.
Other conditions qualify when a licensed provider documents how the footwear helps prevent, manage, or reverse them.
How to Get OOFOS Covered With a Letter of Medical Necessity
There are two ways to get your letter:
- Through Crates, typically in under 24 hours. Complete a 2 to 3 minute online health assessment. A licensed provider reviews your answers and, if you qualify, issues your letter for the footwear. The letter is valid for 12 months, with renewal each year.
- Through your own doctor, a few days to a few weeks. Book a visit and explain that you want to buy supportive footwear with HSA/FSA funds. Ask your doctor to document how it helps prevent, manage, or reverse your condition in a signed, dated letter. You may owe a copay.
How to Buy OOFOS With HSA/FSA Funds
Buy your OOFOS wherever you like, then get the eligible purchase reimbursed.
- Get your Letter of Medical Necessity first. Use either route above before buying your pair.
- Shop online or in store. Pay with your personal card and keep the itemized receipt showing the footwear and the amount paid.
- Get your money back. Crates one-click reimbursement files the claim for you, or upload the letter and receipt yourself. With an HSA, keep both with your tax records.
Under Crates guidance, your letter covers purchases made on or after its issue date. A new letter does not cover shoes you bought earlier. The purchase must also fall after your HSA was established or during your FSA coverage period.
Using pre-tax funds can save you up to 30%. Your actual savings depend on your tax rates and how you fund the account.
Which OOFOS Products Qualify
OOFOS sandals, clogs, and shoes, men's and women's alike, qualify the same way: with an LMN for their medical use. Whatever the model name or price, the medical purpose your provider documents is what qualifies the pair.
These are representative current styles, with approximate regular US prices checked October 26, 2026:
| Product and approximate price | What it is | HSA/FSA eligibility |
|---|---|---|
| OOriginal Sandal, $60 | Open-toe thong sandal | Yes, with an LMN |
| OOahh Slide, $60 | Open-toe slide with a broad strap | Yes, with an LMN |
| OOahh PLUS Slide, $70 | Slide with a wider strap and, according to OOFOS, 6 mm more OOfoam than the OOahh | Yes, with an LMN |
| OOcloog Clog, $80 | Closed-toe, open-back clog | Yes, with an LMN |
| OOmy Stride, $120 | Lace-up shoe with a stretch upper | Yes, with an LMN |
Looking beyond OOFOS? Our shoe eligibility guide covers footwear in general, and our OluKai eligibility guide covers another sandal brand. For support added inside shoes you already own, see insoles and orthotics.
