Ossur Formfit Air Short Low-Top Replacement Liner – CAM Boot Insert
Replace the worn or soiled liner in your Ossur Formfit Air Short cast boot with a genuine OEM replacement. This is the official replacement liner insert designed for the Formfit Air Short (Low-Top) boot — featuring the same breathable, seamless liner with integrated pneumatic air bladder that came with your boot. If you have a Formfit Air Tall boot, see the Tall Replacement Liner instead.
⚠️ Important: Match Your Boot Before Ordering
This liner is designed for the Ossur Formfit Air Short (Low-Top) boot only. It is not compatible with the Tall/High-Top version or the Rebound Air line. Your boot model is printed on the label inside the boot shell.
Size Chart — Match Your Boot Size
Select the same size as your existing Formfit Air Short boot.
| Size | Part Number |
|---|---|
| X-Small | 12356 |
| Small | 12357 |
| Medium | 12358 |
| Large | 12359 |
| X-Large | 12360 |
Features & Benefits
- Integrated pneumatic air bladder — inflates around the ankle for customized compression
- Breathable, seamless liner — comfortable for extended wear during recovery
- Genuine Ossur OEM part — exact fit for Formfit Air Short boot
- Extends boot life — cost-effective alternative to full boot replacement
Authorized Dealer & Warranty: OrthoTape.com is an authorized Ossur dealer. All products are 100% genuine and covered by the manufacturer’s warranty. This product may be eligible for FSA/HSA reimbursement — check with your plan administrator.
Medical Disclaimer: This product is intended as a replacement accessory for the Ossur Formfit Air CAM boot. It is not a substitute for professional medical advice. Always follow your clinician’s instructions regarding your fracture boot protocol.
Frequently Asked Questions
Which boot does this liner fit?
This liner is designed specifically for the Ossur Formfit Air Short (Low-Top) cast boot. It is not compatible with the Formfit Air Tall/High-Top version or the Rebound Air line — those are different boot models with different liner dimensions. Your boot model is printed on the label inside the boot shell. If you have the Formfit Air Tall boot, see the Tall Replacement Liner.
How do I know what size liner to order?
Order the same size as your Formfit Air Short boot — X-Small, Small, Medium, Large, or X-Large. The size is printed on the label inside your boot shell. If you are between sizes or have lost the original boot label, measure your calf circumference at the widest point and consult your clinician or the Ossur sizing guide for the Formfit Air Short.
What conditions require a CAM boot with a pneumatic air liner?
The Ossur Formfit Air Short is commonly prescribed for lower leg and foot injuries including ankle fractures, stress fractures of the foot or lower leg, Jones fractures, Lisfranc injuries, severe ankle sprains, and post-surgical immobilization of the foot and ankle. The integrated pneumatic air bladder provides circumferential compression around the ankle, which helps control edema (swelling) and improves the fit of the boot as swelling changes throughout recovery. Replacing a worn liner restores this compression function.
When should I replace my Formfit Air liner?
Replace your liner when it becomes visibly soiled, develops persistent odor, shows signs of foam compression or flattening, or when the air bladder no longer holds pressure properly. For patients in a fracture boot for 6–12 weeks or longer, replacing the liner midway through treatment is common practice to maintain hygiene and comfort. A degraded air bladder that won’t hold inflation can compromise the therapeutic compression the boot is designed to provide.
Is this a genuine Ossur part, and is it FSA/HSA eligible?
Yes — OrthoTape.com is an authorized Ossur dealer and carries only genuine OEM replacement liners sourced directly from Ossur. This replacement liner is generally eligible for reimbursement through Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA) as a qualified medical expense. Verify eligibility with your plan administrator before purchase.
