Abstract: The present invention is directed to an improved wood post protective sleeve that provides protection against conditions that promote post deterioration, allows for rapid dissipation of trapped exhaust air within the sleeve upon insertion of the post into the sleeve, and provides increased resistance to uplifting or downpressing displacing forces placed upon the post. In one form, the improved post protective sleeve comprises a body and at least one extending displacement resistant projection. The body comprises an internal surface and an external surface with an open end opposed to a bottom wall. The open end slidably receives a ground insert portion of a post. The bottom wall retains the ground insert portion of the post. At least one displacement resistant projection extends from the external surface, and a retainer secures the ground insert portion of the post to the body, preventing the ground insert portion of the post from uplifting out of and separating from the body.