a hard outer shell, comprising an open anterior portion, a base portion, a posterior portion, two oppositely disposed side portions extending from the base portion and connected to the posterior portion, and a pocket with an opening provided in each of the side portions;

a wrap fixed to an interior of the hard outer shell and adapted to enclose at least a lower leg and a portion of a foot of a patient in a fitted position of the therapy boot;

an air bladder comprising two inflatable chambers, a corresponding one of the two inflatable chambers being disposed on an inside of each of the side portions; and

respective gel packs, one of the respective gel packs adapted to be inserted through a corresponding one of the openings into a corresponding one of the pockets in between the air bladder and at least one of the lower leg or the ankle to provide heat or cold to at least one of the lower leg and the ankle;

wherein:

upon pressurization of the air bladder, the gel packs are configured to be pressed against at least one of the lower leg and the ankle by the corresponding inflatable chamber of the air bladder; and

each pocket is configured to accommodate the wrap and the corresponding one of the two inflatable chambers of the air bladder such that the gel packs are insertable into the openings of the pockets and through slits of the wrap such that the gel packs are configured to abut against the ankle or the lower leg of the patient when the therapy boot is in the fitted position, prior to the pressurization of the air bladder.