A joint sheath includes a first side part at the front side of the corresponding knee and a second side part at the rear side of the corresponding knee. The thickness of the first side part is greater than the thickness of the second side part, so as to achieve the purpose of heat preservation. The second side part is a single-layer woven structure, so as to avoid the crease of the second side part when the knee is bent.一種關節護套，係包括對應膝蓋前側處之第一側部及對應膝蓋後側處之第二側部，藉由該第一側部之厚度大於該第二側部之厚度，以達到保暖之目的，並藉由該第二側部係為單層編織結構，以於膝蓋彎曲時，避免該第二側部產生皺摺。
