01 Physician
Standard of care
- Immobilization that performs as well as casting, or better
- Breathable, to help prevent the skin problems of a damp cast
- An option patients ask for and recommend
A waterproof, breathable net for wrist and forearm fractures. On in three minutes, set without water or heat, off without a saw.
FDA listed · Reimbursed by private and public payers
Filling
Resin 0:00 of 3:00
The pack fills every strand from the port. Shown at 60× speed.
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Day 1
Shower, swim, sleep. Water runs straight through.
Plaster or fiberglass
42 days
Cast21
42 days
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A flexible, hollow lattice that slides on like a glove. Ambidextrous sizes, shaped by hand as it sets.
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A fast-curing pack connects at the forearm and fills every strand from the inside. No water, heat or light.
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Rigid where the fracture needs it, lighter than a traditional cast, performing as well or better.
Slide the sleeve over the hand and position it on the forearm.
Connect the pack and press. Resin runs through every strand.
It hardens in minutes on its own. Trim the line and your patient is done.
Press and hold to fill the net.
Or click once and watch.

01
Physician
02
Cast tech · MA
03
Administrator
04
Patient
01 Physician
Standard of care
02 Cast tech · MA
3 min
03 Administrator
$0 capital
04 Patient
Day 1 shower
Certification for your team happens in person or on video, and certified clinics appear in the clinic finder. US government and VA buyers: we work with an authorized partner network that includes a Service-Disabled, Veteran-Owned Small Business.
Indiana
Hand specialty

A patient wanted a waterproof option before a family holiday. Cast21 referred them to a physician who carried it.
New patient
Illinois
Certified orthotist

A child was unhappy in a fiberglass cast after surgery. The family moved to a provider who could fit Cast21.
Switched
Washington, DC
Academic medical center

Two weeks after surgery for a 24-week non-union, the patient asked for Cast21. It was windowed and used with a bone stimulation device.
Asked for it
“10/10. It's easier to use and my patients actually ask for this more often than anything else.”
Dr. Matt · Founding physician, California

The net is waterproof and open to the air, so life carries on while the bone heals. Shower, swim, then let it dry on its own.
“I hopped right in the shower without even thinking twice.”
Mackenzie · Michigan
“No itch, no sweat. I forgot I was wearing it.”
Lynne · Tennessee
“I was hesitant at first, but the x-rays showed nothing moved. I healed perfectly.”
Iris · Illinois
And yes, friends can still sign it.
Clinical · Children's Hospital Los Angeles
Promising results for children with wrist fractures treated with Cast21.
Read the report ↗
Materials · MDPI
Cast21 releases significantly less isocyanate than traditional fiberglass casts.
Read the paper ↗
Regulatory · FDA
Cast21 has completed its regulatory requirements and is listed with the FDA.
Recognition · Forbes
Forbes 30 Under 30 in Healthcare named co-founders Ashley Moy and Jason Troutner in 2020.
In the pressNew York PostYahoo SportsDaily MailUpworthyGood News NetworkHackadayThe Denver ChannelFox Illinois
Each pack hardens into its own mix, so no two nets look the same. Children choose theirs in the chair, which changes how the whole visit feels.
Tell us about your practice. We send a sample kit and set up certification for your team, in person or on video.
Here for yourself or your child? Ask your doctor about Cast21, or find a certified clinic near you.