A therapeutic fabric boot that warms the calf and foot, permits ambulation and provides for moisture absorption and selective exposure and ventilation of the covered extremity. An internal foam cradle restricts foot movement and reduces pressure at the heel and calf when lying in a supine position. A re-sizable, flat, hinged foam extension piece extends from the cradle and folds to protect the heel, sole and toes. Several fleece and moisture absorbent fabric cover panels selectively fasten about the foot and calf. Numerous hook and loop fasteners are fitted to external surfaces and attach to straps and/or outer cover pieces upon wrapping the straps and panel pieces about the supported lower calf and foot.