Össur Formfit Cast Boot (Tall / High-Top, Open-Toe) – Pneumatic CAM Walking Boot
If you're searching for a cast boot, CAM boot, walking boot, fracture boot, or orthopedic boot, the Össur Formfit Walker Air Tall is a lightweight, affordable open-toe pneumatic CAM walker designed to immobilize the foot and ankle at 90° while allowing controlled walking (as prescribed).
What this is (and what people call it)
This is a removable CAM walker boot (Controlled Ankle Movement). Many patients call it a cast boot or walking cast boot even though it's removable. It's also commonly searched as a fracture boot or "boot for broken foot."
Important Fit Tip: boots fit a size range (not a perfect shoe fit)
One of the most common issues with any medical boot is "range sizing." These boots are sized in shoe-size ranges to allow room for swelling, thicker socks, and dressings. If you're at the low end of the range, the boot can feel roomier than a shoe. If you're near the top end, it will feel more exact.
- Seat your heel fully back before tightening straps.
- Tighten straps evenly (don't crank one strap and leave others loose).
- Use the air bladders to take up extra volume (avoid over-inflation).
- If between sizes: minimal swelling / narrow foot → smaller may feel more secure; swelling/dressings → stay in range or size up.
Size Chart
| Size | Men's Shoe Size | Women's Shoe Size | Part Number |
|---|---|---|---|
| XS | 2 – 4.5 | 3.5 – 6 | A-W0200BLK |
| S | 4.5 – 7.5 | 6 – 8 | A-W0400BLK |
| M | 7.5 – 10.5 | 8.5 – 11.5 | A-W0600BLK |
| L | 10.5 – 12.5 | 11.5 – 13.5 | A-W0800BLK |
| XL | 12.5+ | 13.5+ | A-W1000BLK |
Internal Measurements + Height + Weight (Tall / High-Top)
These measurements help customers choose the right cast boot when shoe sizing alone isn't enough—especially for swelling, dressings, or "in-between" fits.
| Size | Men's Shoe Range | Women's Shoe Range | Internal Foot Length | Height (Heel → Top) | Boot Weight |
|---|---|---|---|---|---|
| XS | 2 – 4.5 | 3.5 – 6 | 8.86" 22.5 cm |
14.96" 38.0 cm |
2.09 lb 950 g |
| S | 4.5 – 7.5 | 6 – 8 | 9.57" 24.3 cm |
14.96" 38.0 cm |
2.29 lb 1040 g |
| M | 7.5 – 10.5 | 8.5 – 11.5 | 10.83" 27.5 cm |
16.93" 43.0 cm |
2.65 lb 1200 g |
| L | 10.5 – 12.5 | 11.5 – 13.5 | 11.54" 29.3 cm |
16.93" 43.0 cm |
2.92 lb 1325 g |
| XL | 12.5+ | 13.5+ | 12.40" 31.5 cm |
17.32" 44.0 cm |
3.08 lb 1395 g |
Tip: Compare your measured foot length (heel to longest toe) to the "internal foot length" and leave a little room for swelling.
When to choose the Tall / High-Top cast boot
The tall/high-top design is typically chosen when you want more ankle coverage and control than a low-top boot. For foot problems where the ankle is less affected, a low-top boot may be preferred (as prescribed).
Why patients choose this cast boot
The Formfit Walker Air Tall is a lightweight, affordable alternative to conventional casting. Compared to a cast, a removable CAM boot can allow easier fit adjustments as swelling changes and supports walking with a rocker sole (as prescribed).
The integrated pneumatic system is designed to provide adjustable compression that may improve stability and comfort during rehabilitation. The shock-absorbing sole helps reduce impact at heel strike.
Fitting Video
* This fitting tutorial applies to all Össur Formfit Walker boots — Tall, Short, Air (Pneumatic), and Non-Inflated. The donning and adjustment technique is the same across the entire Formfit Walker family.
Indications (as prescribed)
- Soft tissue injuries
- Grade 2 and 3 sprains
- Stable fractures
- Post-operative, trauma, or rehab use
Features & Benefits
- Open-toe design for breathability and easier toe checks
- Integrated pneumatic system for adjustable compression
- Low, wide rocker bottom promotes a stable, natural gait
- Shock-absorbing sole for reduced impact at heel strike
- Breathable, seamless liner
- Designed for outdoor use where traditional casts can be limiting
Additional Video
Reimbursement Code: L4361 | FSA/HSA Eligible
Shipping: Based on your location, ships from NJ or CA warehouse in 2–3 business days.
OrthoTape.com is an authorized Össur dealer. Authentic product. 6-month manufacturer warranty. This product is intended for use as directed by a licensed healthcare provider.
Also Available: Formfit Low-Top (Short)
If your ankle is less affected and you want a lower-profile cast boot, the low-top version may be preferred (as prescribed).
View Formfit Low-Top
Authorized Dealer | 6-Month Manufacturer Warranty | Authentic Product Quality Guaranteed
OrthoTape.com is an authorized dealer and guarantees authenticity and craftsmanship. Unlike marketplaces where older inventory or knock-offs can appear, we source directly from the manufacturer and back it with real support.
Call: 800-580-9887 (M–F 9:30–5:00 EST)
