How to Wrap a Cast with Cast Tape and Under-Cast Padding
By Medical Supply Pros | Published: 2026-11-02
Category: How-to Guides
Learn how to wrap a cast with cast tape and under-cast padding. Follow our step-by-step guide for a secure, comfortable cast that protects the skin and stays in place.
Quick answer
To wrap a cast, start by applying a smooth layer of under-cast padding, then wrap cast tape over it in overlapping turns, molding as you go. Use McKesson Cast Tape for strength and Medline Sterile Wytex Under-Cast Padding for comfort.
Why padding and tape work together
Under-cast padding cushions the skin and protects bony areas from pressure, while cast tape provides rigid support. Skipping padding or applying it unevenly can lead to skin irritation or pressure sores. The padding also absorbs moisture and helps the cast conform to the limb.
Choosing the right materials
Select cast tape that suits the required strength and working time. McKesson Cast Tape offers customizable working time and rapid weight bearing, which can be useful for active patients. For padding, Medline Sterile Wytex Under-Cast Padding is made of 100% cotton, low-linting, and provides extra loft for comfort. Match the padding width to the limb size to avoid wrinkles.
Common mistakes to avoid
Wrapping too tightly can restrict circulation, while wrapping too loosely allows the cast to slip. Avoid creases in the padding, as they can cause pressure points. Also, don't skip overlapping the tape by at least half its width to ensure strength.
Step-by-step cast wrapping
- Prepare the limb and materials: Clean and dry the skin, then gather cast tape, under-cast padding, and scissors. Cut padding strips long enough to wrap around the limb with slight overlap. Check that the padding is at least as wide as the limb to avoid gaps.
- Apply under-cast padding: Wrap the padding smoothly around the limb in overlapping turns, starting from the distal end and moving proximally. Use additional padding over bony prominences. Avoid stretching the padding too tight; it should be snug but not compressing.
- Wrap with cast tape: Open the cast tape and wrap it over the padding in a spiral, overlapping each turn by half the tape width. Mold the tape to the limb contours as you go. Do not pull the tape excessively; it should conform without constricting.
- Check circulation and comfort: After wrapping, press on a toenail or fingernail to check capillary refill. Ask the patient about any numbness, tingling, or excessive pressure. If circulation is compromised, loosen the cast immediately and rewrap.
- Finish and secure the end: Tuck the final end of the tape under the last turn or secure with a small piece of tape. Smooth any rough edges. Ensure the end is secure to prevent unraveling.
Product facts
- McKesson Cast Tape: McKesson Cast Tape features customizable working time and rapid weight bearing. Allows you to adjust application pace and supports quicker return to activity.
McKesson Cast Tape - Medline Sterile Wytex Under-Cast Padding: Medline Sterile Wytex Under-Cast Padding is made of 100% premium cotton fibers and is low-linting. Provides gentle skin contact and a cleaner application with less lint debris.
Medline Sterile Wytex Under-Cast Padding
