Ossur 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 Ossur 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."
Size Chart & Fit Guide
Universal fit — fits left or right foot.
⚠️ Important: These Boots Fit a Size Range — Not a Single Shoe Size
CAM walking boots are designed to accommodate a range of shoe sizes — not a single perfect fit. The extra room allows for bandaging, swelling, post-surgical dressings, and thick socks common during recovery.
- Choose the smaller size if swelling is minimal — snugger fit.
- Choose the larger size if you have significant swelling, thick bandaging, or a cast underneath. Use the air bladders to fine-tune compression.
When in doubt, go up a size. Your clinician can help determine the best fit.
Method 1 — Size by Shoe Size
| 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 |
📏 Method 2 — Measure Your Foot Length (Most Accurate)
Measuring your actual foot length in inches gives you the most accurate size.
- Place a blank piece of paper on a hard floor.
- Stand on the paper with your heel touching a wall.
- Mark the tip of your longest toe.
- Measure from the heel line to the toe mark in inches.
- Use the internal measurements table below to find your boot size.
Tip: If you have swelling or a cast sock, add ¼"–½" and size up.
Method 2 — Internal Measurements + Height + Weight (Tall / High-Top)
| Size | Men's Shoe | Women's Shoe | 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) |
2.87 lb 1300 g |
| XL | 12.5+ | 13.5+ |
12.60" (32.0 cm) |
18.90" (48.0 cm) |
3.09 lb 1400 g |
HCPCS Code: L4361 | FSA/HSA Eligible
Shipping: Based on your location, ships from NJ or CA warehouse in 2–3 business days.
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