Is walking boot immobilisation done with thermoplastic splint material?

A walking boot, sometimes called a moon boot or CAM boot, is selected and adjusted to limit movement around the foot or ankle while still allowing prescribed walking. Its liner and straps help hold the limb in position, and the sole is shaped for stability.

Thermoplastic splint material softens when heated and can be shaped around a body part before it cools. It is useful when a clinician needs a custom fit, a removable support, or access to a particular area. The material and device choice depend on the injury, swelling, skin condition, and weight-bearing plan.

Use the boot for the periods prescribed and follow instructions about weight-bearing. Keep the skin clean and dry, check for rubbing, and loosen or seek adjustment if swelling makes the fit uncomfortable. Do not add extra padding or alter the shell without advice. For more detail, read [Walking Boot Immobilisation](/treatments/non-surgical-orthopedics/walking-boot-immobilisation/) and [Thermoplastic Splint Material](/materials/thermoplastic-splint-material/).

Seek prompt advice for worsening pain, persistent rubbing, blisters, colour change, cold toes, increasing swelling, or numbness. Urgent assessment is needed if the foot becomes suddenly pale or blue, sensation is lost, or severe pain is not relieved after the boot is removed as instructed.

Ask whether your boot should stay on while sleeping, how much weight you may place through the leg, when it can be removed for hygiene or exercises, and whether a custom thermoplastic splint would serve a different purpose.