GIFT80: $80 off two CastleFlexx Luxury devices. Use the code at checkout.
Save $80 on two CastleFlexx Luxury devices
4.9/5 on Okendo
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2,500+ five-star reviews
Your heel isn't the problem.
The chain pulling on it is.
Try it for just 5 minutes a day. The patented foot hammock holds your toes back at true dorsiflexion, so your plantar fascia, Achilles and calf release together.
A one-time tool for less than three PT sessions. HSA/FSA eligible.
Patent-protected foot hammock, refined with physical therapists. 200,000+ customers.
30 days, full refund, no restocking fee. That includes gifts.
Wean off pain meds, few mins a day" Leah H., chronic 7-year back/leg pain ✓ Verified ★★★★★
Free shipping to the continental US, EU, and most of Canada.
30 days, full refund, no restocking fee. 4 interest-free installments, or from $22.47/mo with Shop Pay. HSA/FSA eligible, so pre-tax dollars lower what this actually costs you.
PRODUCT DETAILS
Who CastleFlexx is built for
Built for people who are done guessing with straps, towels, and random
stretches. Ideal for tight hamstrings, calves, hips, plantar fascia, desk-
body tension, post-workout stiffness, post-injury mobility work, athletes,
runners, 65+ users, and anyone who wants a repeatable way to move
better at home.
Materials and specs
A brushed aluminum frame and premium cork handles, with reinforced webbing around a patented foot hammock for a secure, controlled stretch. The removable 2 lb FlexxBar adds assisted tension for full-body strengthening.
Designed and shipped from the USA
Designed and shipped from the USA
Shipping and returns
Free shipping on every device to the continental USA and the EU, plus most of Canada, and a 30-day money-back guarantee so you can try CastleFlexx at home.
Four reasons to stretch with CastleFlexx
A patented plantar fascia hammock. Designed to support your toes in dorsiflexion as you stretch.
You control the angles and intensity. Adjust your position and pull to personalize your stretch.
Target your toes, plantar fascia, Achilles and calf together. One connected stretch that goes beyond the bottom of your foot.
Trusted by 200,000+ customers. Rated 4.9/5 on Okendo from 2,500+ reviews.
🏆 200,000+ CUSTOMERS
🏆 200,000+ CUSTOMERS
Real people. First stretch reactions.
Reaction-shoot first timers, post-surgery rehab buyers, athletes, and people who stand all day for work.
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"That is a massive difference."
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"It helps me stretch areas I would not be able to do myself."
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"Have you ever had a stretch this intense?"
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"Great way to start the day. Really open up."
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"You're gonna see me shocked at how well this thing's working."
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"It's an ace in the hole if you drive a lot."
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"It's crazy how much of your lower back pain actually comes from the stiffness in your legs."
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"One thing that has minimized my injuries is this CastleFlexx."
If you are in the 1% that doesn't feel better in 30 days or less, just return it! 30 days, full refund, no restocking fee. That includes gifts.
Designed for the
muscles behind the pain.
Back Pain
Back tightness often shows up when hips, hamstrings, and glutes get stiff or weak. Dan Castle went from level 10 pain in his lower back for two decades to being pain free after CastleFlexxing daily for 10 to 20 minutes, with MRI results to prove it. CastleFlexx helps you stretch the entire posterior chain using active and passive stretching so you can build strength and flexibility at the same time.
CastleFlexx is a stretching tool, not a medical device. Individual results vary. Consult your physician
before beginning any new stretching or mobility program, especially after surgery or with an existing
condition.
Pain pills made me worse. Clinicians were helpful but too expensive every week.
This device helped fix me.
Dan Castle herniated L4, L5, and S1. The medical menu read pills now, surgery later. He went looking for a third option and ran into a smaller problem first: he couldn't reliably hold the one stretch his clinicians kept assigning him at home. A strap slips, and the position is gone.
So he built a device that does the holding, then spent years refining the hammock geometry with physical therapists until it earned a patent.
"Your back is not the issue. Your back is the symptom of the issue."
Tight from the feet to the lower back. That's the chain this stretch works.
The plantar fascia connects your heel bone to your toes. The calf and hamstring above it share the load, and when they shorten that band takes the pull with every step. The patented foot hammock keeps the heel anchored and pulls the toes back, the one position that lengthens the whole line together.
like a warm-up.
Built for more than one stretch.
arch
Designed alongside PTs. Used between appointments.
Physical therapists and chiropractors recommend CastleFlexx as a between-appointment and post-discharge tool. It doesn't replace your PT. It's the part of the home routine your clinician keeps reminding you to do, the one that's hard to hold with a strap.
What you're actually paying for.
he price is $239. Fair question. Here is what it's made of and where it can create real repeat savings.
67.
It's the same math as any good tool. Pay once, retire a recurring bill. 200,000+ customers did this math before you.
The pros stretch with it too.
Champions, Olympians, and household names keep one in the gym bag.
"We don't use cheap straps anymore, we use
CastleFlexx. I use it an hour a day. CastleFlexx is
by far the best."
Nickeil Alexander-Walker
#7 | ATLANTA SHOOTING GUARD
too." (Instagram @marthastewart48, 2022)
Stop paying $100 a session.
Own the stretch for $239.
4.9/5
Frequently asked.
What size am I?
Standard fits 5'0" to 5'8". Large fits 5'9" to 6'2". X-Large fits 6'3" to 6'9". XX-Large fits 6'7" and up.
Will it help my plantar fasciitis?
CastleFlexx is a stretching tool and makes no medical claims. What it does is hold your toes back at true dorsiflexion so the calf, Achilles and the band under your foot lengthen together, the stretch you may already have been told to do at home. Some users have reported online that it helped them. Results vary. Talk to your physician first.
Is this safe for my age or my condition?
You control the depth at every step. The hammock holds the position, the strap sets the intensity, and nothing pulls further than you choose. Buyers range from college athletes to people in their 80s. If you're post surgery or working through a diagnosed condition, check with your physician first, then start shallow.
Do I keep my insoles or my night splint?
Keep whatever your clinician gave you. CastleFlexx is a stretching tool for the calf, the Achilles and the band under your foot, and people use it alongside physical therapy and the rest of their routine. Talk to your physician about anything you plan to change.
What's the difference between Luxury and Sport?
Luxury is the heavier home model with brushed-cotton fabric. Sport is the lighter travel model with quick-dry weave. Most first-time buyers pick Luxury.
Is it HSA/FSA eligible?
Yes. The device is HSA/FSA eligible at checkout. Pre-tax dollars cover the full eligible amount.
Does Medicare cover it?
Not directly. HSA/FSA covers the device for eligible buyers.
Is this a medical device?
No. CastleFlexx is a patented stretching tool, not a medical device, and we don't make medical claims. It was designed alongside physical therapists and chiropractors, and many buyers come to it after surgery or while working through long-term mobility challenges, but it is not intended to diagnose, treat, cure, or prevent anything. Talk to your physician before starting any new stretching or mobility program.
Why does this cost what it costs?
Two answers. First, the patent: the foot hammock holds your foot at a position basic bands and towels can't, and the materials and assembly add up. Second, the math: one physical-therapy session is often $100 or more, and most clinicians ask you to come back multiple times. CastleFlexx is a one-time investment at less than the cost of three sessions, yours to use daily.
How many stretches can I do with it?
Eight named stretches in the basic library. The optional CastleFit app adds guided classes if you want a program.
What's the guarantee?
30 days, full refund, no restocking fee. If something goes wrong with the device after that, we'll repair or replace it. Built to last for life.
Where is it made?
Designed and assembled in the US. Manufacturing details available on request.
Start walking without pain again.
CastleFlexx Luxury Edition
Support your toes. Stretch your plantar fascia. Include your Achilles and calf in the same stretch.
Targeted stretching. You control the intensity.
$239
Patented design
One-time device purchase
30-day returns
View return policy
Designed for stretching deeper. Not a medical device. CastleFlexx and CastleFit make no medical claims. The stretching device and program are not intended to diagnose, treat, cure, or prevent any disease or condition. Consult your physician before beginning any new stretching or mobility program, especially after surgery or with an existing
condition.
$239