Ossur Formfit Air CAM Walking Boot – Tall High Top | Pneumatic Fracture & Ankle Boot
The Ossur Formfit Air Tall CAM Walking Boot is a lightweight, affordable pneumatic CAM walker with an integrated air bladder for adjustable compression. The tall high-top, open-toe design immobilizes the foot and ankle at 90° while allowing controlled walking as prescribed — ideal for ankle fractures, sprains, and post-operative rehabilitation. For the short/low-top version, see the Formfit Air Short.
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, fracture boot, or walking cast boot. It fits either the right or left foot — no side selection needed. The Formfit Air is Ossur’s value-tier pneumatic walking boot line.
Short vs. Tall — Which height do I need?
- This boot (Tall High-Top) — Extends above the ankle. Best for ankle fractures, severe sprains, or Achilles injuries requiring more immobilization.
- Formfit Air Short — Lower profile, best for forefoot injuries, toe and metatarsal fractures.
Size Chart & Fit Guide
Universal fit — fits left or right foot.
⚠️ Important: These Boots Fit a Size Range — Not a Single Shoe Size
The extra room allows for bandaging, swelling, post-surgical dressings, and thick socks. When in doubt, go up a size.
Size by Shoe Size
| Size | Men's US Shoe | Women's US Shoe | Part Number |
|---|---|---|---|
| X-Small | 2 – 4.5 | 3.5 – 6 | A-W0200BLK |
| Small | 4.5 – 7.5 | 6 – 8 | A-W0400BLK |
| Medium | 7.5 – 10.5 | 8.5 – 11.5 | A-W0600BLK |
| Large | 10.5 – 12.5 | 11.5 – 13.5 | A-W0800BLK |
| X-Large | 12.5+ | 13.5+ | A-W1000BLK |
Size by Internal Measurements (Tall High-Top)
| Size | Internal Foot Length | Height (Heel → Top) | Boot Weight |
|---|---|---|---|
| X-Small | 8.86" (22.5 cm) | 14.96" (38.0 cm) | 2.09 lb (950 g) |
| Small | 9.57" (24.3 cm) | 14.96" (38.0 cm) | 2.29 lb (1040 g) |
| Medium | 10.83" (27.5 cm) | 16.93" (43.0 cm) | 2.65 lb (1200 g) |
| Large | 11.54" (29.3 cm) | 16.93" (43.0 cm) | 2.87 lb (1300 g) |
| X-Large | 12.60" (32.0 cm) | 18.90" (48.0 cm) | 3.09 lb (1400 g) |
Clinical Indications (as prescribed)
- Ankle fractures (stable)
- Grade 2 and Grade 3 ankle sprains
- Achilles tendon injuries
- Post-operative ankle and foot rehabilitation
- Soft tissue injuries with edema
Features & Benefits
- Pneumatic air bladder — adjustable compression for edema control
- Tall high-top, open-toe design — maximum ankle immobilization
- Rocker bottom outsole — promotes natural gait
- Breathable liner — moisture management for extended wear
- Universal fit — fits left or right foot
- Lightweight construction — comfortable for all-day wear
HCPCS Code: L4361 | FSA/HSA Eligible
Shipping: Ships from NJ or CA warehouse in 2–3 business days based on your location.
OrthoTape.com is an authorized Ossur dealer. Authentic product. 6-month manufacturer warranty. Use as directed by a licensed healthcare provider.
Frequently Asked Questions
What is the difference between the Ossur Formfit Air and the Ossur Rebound Air CAM boot?
Both are pneumatic CAM walking boots from Ossur, but the Rebound Air is Ossur’s higher-tier line with a more rigid shell, dual-density rocker sole, and closed-toe design. The Formfit Air is Ossur’s value-tier option — lighter, more affordable, and open-toe. Both provide effective immobilization for ankle fractures and sprains. Your clinician will determine which is appropriate for your injury and activity level.
What ankle and foot conditions is the tall CAM boot used for?
The Ossur Formfit Air Tall CAM Boot is prescribed for stable ankle fractures, Grade 2 and Grade 3 ankle sprains, Achilles tendon injuries, and post-operative ankle rehabilitation. The tall high-top design provides greater immobilization of the ankle joint compared to a short boot, making it the preferred choice when the ankle itself is injured rather than just the forefoot or toes.
What does the pneumatic air bladder do and how do I use it?
The integrated pneumatic air bladder applies gentle, even compression around the foot and ankle to control edema (swelling) and improve fit as swelling changes throughout the day. Pump until you feel firm, comfortable compression — not tight or painful. Release air by pressing the valve if the boot feels too tight, especially in the morning when swelling is typically lower.
How long will I need to wear a CAM boot after an ankle fracture?
Most stable ankle fractures require 6–8 weeks in a CAM boot. Grade 2–3 ankle sprains typically require 4–6 weeks. Achilles tendon injuries may require 8–12 weeks of progressive boot use. Your orthopedic surgeon or podiatrist will monitor healing with follow-up imaging and advise when it is safe to transition out of the boot.
Can I walk normally in a CAM boot, and do I need crutches?
The rocker bottom sole promotes a more natural heel-to-toe gait while wearing the boot. Most patients with stable fractures or moderate sprains can bear weight as tolerated — your doctor will specify your weight-bearing status. Crutches may be recommended initially. As healing progresses, most patients transition to full weight-bearing in the boot before returning to regular footwear.
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