A broken wrist has been treated the same way since 1852. Cast21 opens it.

A waterproof, breathable net for wrist and forearm fractures. On in three minutes, set without water or heat, off without a saw.

1852. A Dutch army surgeon wraps a fracture in plaster. Wrap it, seal it, wait, saw it off.

The 1970s. Fiberglass makes it lighter. The six weeks stay the same: itch, sweat, a bag over the arm in the shower.

Cast21. Rigid where the fracture needs it, open everywhere else. Hold the bone. Free the rest.

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.

◇

Day 1

Shower, swim, sleep. Water runs straight through.

A wrist fracture is about six weeks in a cast. Here is what those 42 days look like, closed and open.

Plaster or fiberglass

42 days

  • Week 1A bag over the arm for every shower.
  • Week 2The itch starts. Nothing can reach it.
  • Week 4Sweat and smell build up under the cast.
  • Week 6The cast saw: loud, and frightening for a child.

Cast21

42 days

  • Week 1Showers as usual. Water runs straight through.
  • Week 2Swimming, beach, sports practice where the doctor allows.
  • Every dayAir on the skin, so less itch, sweat and smell.
  • Week 6Removed without a saw, no special equipment.

◇

Sleeve

A flexible, hollow lattice that slides on like a glove. Ambidextrous sizes, shaped by hand as it sets.

◈

Resin

A fast-curing pack connects at the forearm and fills every strand from the inside. No water, heat or light.

◆

Structure

Rigid where the fracture needs it, lighter than a traditional cast, performing as well or better.

The empty Cast21 sleeve, drawn in white dots. Resin filling the sleeve from the forearm end. The set net, every strand coloured mint to violet.

One net, nothing else to carry. The roll, the bucket and the saw, replaced by a kit that fits in a drawer.

Application. Three minutes, start to set.

  1. Slide

    Slide the sleeve over the hand and position it on the forearm.

  2. Fill

    Connect the pack and press. Resin runs through every strand.

  3. Set

    It hardens in minutes on its own. Trim the line and your patient is done.

Ready0:00

Press and hold to fill the net.
Or click once and watch.

Application
About 3 min
Removal
No cast saw
Equipment to buy
None
Applied by
Physicians, techs, MAs

A cast is a team job. Cast21 was designed around everyone in the room.

The Cast21 net at the centre of the clinic team.

01

Physician

02

Cast tech · MA

03

Administrator

04

Patient

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

02 Cast tech · MA

3 min

  • No water, heat or extra equipment
  • Fail-safes built into the kit
  • Removal without special equipment, no saw

03 Administrator

$0 capital

  • No toasters, scanners or water baths to buy
  • Private and public payers reimburse
  • Less inventory, minutes saved every visit

04 Patient

Day 1 shower

  • Waterproof and open to the air
  • Lighter than a traditional cast
  • Chosen in a colour, signed by friends

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.

From clinics that already carry it. Patients ask for Cast21 by name. Some change clinics to get it.

Indiana

Hand specialty

A patient shading her eyes in the sun, wearing a teal Cast21 net.

Wrist fracture

Referred in before a trip

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 clinician fitting a pink Cast21 net on a smiling patient.

Ganglion cyst, pediatric

Switched providers

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

A physician checking a patient's teal Cast21 net.

Scaphoid non-union

Windowed for a bone stimulator

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

A boy laughing in a swimming pool with his blue Cast21 net in the water.

For patients and parents. Swim, shower and sleep without the itch.

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

Find a clinic near you →

And yes, friends can still sign it.

Evidence. Read the sources, not our adjectives.

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

Colour. Pick one. It sets as a gradient.

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.

Five raised arms in Cast21 nets: teal, red, blue, grey and purple.

For your practice. Try it on your next wrist.

Tell us about your practice. We send a sample kit and set up certification for your team, in person or on video.

In the kit
A sample net, a resin pack, and the application and removal guide
Training
Certify your physicians, techs and MAs together
Billing
Your advocate walks the billing team through reimbursement
Patients
Certified clinics appear in the clinic finder

Request a sample kit

Your role

We use your details only for this request. A person from our team replies.

Here for yourself or your child? Ask your doctor about Cast21, or find a certified clinic near you.

Find a clinic ↗

AlsoDistributorsPressGovernment and VA