EXOS Thumb Spica Fracture Brace with BOA | Thermoformable Thumb Spica Cast Splint

Exos Thumb Spica Fracture Brace with BOA waterproof Cast Splint alternative on a white background

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EXOS Thumb Spica Fracture Brace with BOA® (Thermoformable Cast Splint)

A reformable, water-resistant thumb spica fracture brace that delivers cast-like stabilization with the convenience of adjustability. Designed to stabilize the thumb (adduction), 1st MCP & 1st CMC joints, while also supporting the wrist joint complex.

Why clinicians and patients choose EXOS

Thermoformable (reformable) for a custom fit and better immobilization
BOA® micro-adjustable dial helps accommodate swelling/atrophy and fine-tunes compression
Water-resistant materials for day-to-day life (dry after wet exposure)
Lightweight & adjustable—one brace throughout treatment (reduces waste)
Latex-free

Which Exos Thumb Spica Do I Need?

You may have noticed on our site that there are TWO Exos Thumb Spica Braces. If you have a prescription/diagnosis, match what your provider recommended.

Exos Long Thumb Spica II™ (BOA®)

Best for: thumb injury plus needing more wrist/forearm control.

Primary differences/uses:

More forearm length = helps limit wrist motion more.
Often chosen for scaphoid (navicular) concern or when wrist stability matters.
Helpful for thumb base (CMC) pain when wrist movement aggravates symptoms.
Good when your provider wants strong immobilization + extra wrist control.

Exos Thumb Spica™ Fracture Brace

Best for: fracture-style support, especially with swelling/dressings.

Primary differences/uses:

Designed for fracture-style immobilization of wrist + thumb.
More accommodating for swelling and bulky dressings early on.
Commonly used when there's a distal radius/ulna wrist-area injury.
Often selected for acute injury and some post-op situations.

Size Chart & Fit Tips (Most Returns Are From Sizing)

How to measure: Wrap a soft tape loosely around your hand at the measurement point shown in the diagram. If you measure between sizes or prefer a roomier fit (or expect swelling), size up. This brace can be molded for a better fit.

Hand measurement diagram showing where to measure circumference for EXOS thumb spica brace sizing

Size	Hand Circ. (in)	Hand Circ. (cm)	Brace Length	Left Part #	Right Part #
XS	7.25" – < 8"	18.5 – 20 cm	9"	315-31-1111	315-32-1111
S	8" – < 9"	20 – 23 cm	10"	315-41-1111	315-42-1111
M	9" – < 10"	23 – 25.5 cm	11.25"	315-51-1111	315-52-1111
L	10" – < 11"	25.5 – 28 cm	12.25"	315-61-1111	315-62-1111
XL	11"+	> 28 cm	13"	315-71-1111	315-72-1111

Fit note: A "perfect shoe-like fit" is not the goal—this is a medical brace designed to accommodate swelling and be molded. If you're on the low end of the range, you may have extra room until molded; if you're on the high end, it should feel more "true to size."

Heating & Application (Important)

Important: This brace must be heated to properly mold for best fit. Watch the videos below before fitting.

Requirement	Manufacturer Specification
Ideal Temperature	200°F (93°C)
Maximum Safe Temperature	212°F (100°C)
Heating Time	Approximately 3–5 minutes
Working Time	3–8 minutes before it hardens
Heating Method	Convection oven or hair dryer (for small adjustments)
Warning	Never use a microwave or high-heat industrial heat guns.

Important: EXOS braces are intended to be fitted and remolded by trained medical professionals. Heating/molding performed outside medical guidance may affect fit, safety, and warranty coverage. Many have successfully heated these items on their own using a home oven and wrapping the brace in a damp towel, but we cannot cover this under warranty if it is not done by a trained medical professional.

Videos

Instructions

Authorized Dealer | Authentic Product Quality Guaranteed

OrthoTape.com is an authorized dealer. We source directly from the manufacturer and back our products.

Important purchase & use statement: By purchasing an EXOS brace or accessories, you acknowledge you are either a qualified orthopedic technician or currently under the supervision of a medical provider who prescribed the product. Follow the manufacturer's directions. The end-user assumes responsibility for use/misuse. OrthoTape.com is a distributor and is not responsible for injury due to misuse, inappropriate application, or other causes.

Looking for more EXOS braces?

Browse our full collection of EXOS thermoformable braces — including wrist, thumb, and fracture models.

Shop All EXOS Braces →

Exos Thumb Spica Fracture Brace with BOA | Cast Splint - Djo Global

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