The AliMed Air Boot is an easy-to-clean, lightweight boot that uses a cushion of air to elevate the lower leg for complete pressure relief and improved airflow to the heel. Soft flannel interior is gentle on fragile skin and helps wick away moisture. The Air Boot has two independent inflation zones: zone one fits the boot to the foot and lower leg while, zone two allows you to adjusts the height of the heel. One size fits all. Ready to use right out of the box.