A kind of protective device,The system comprises a first expansion cloth piece.First and second expansion cloth,A fixed part group and an adjusting part group；After adjustment and stretching, the first and second joint parts of the first adjusting part of the adjusting part group are combined with the first gluing part of the first stretching cloth piece.The second joint part of the second adjusting part of the adjusting part group is respectively combined with the second gluing part of the second stretching cloth part.Through this creation, it can be applied to the quadriceps of thigh and the muscles around it.And then it conforms to the ergonomic design.And can achieve the purpose of adjusting performance.一種護具，係包含有一第一伸縮布件、一第二伸縮布件、一固定件組以及一調整件組；而經調整拉伸該調整件組之一第一調整件的一第二結合部與該第一伸縮布件之一第一黏扣部相結合，且調整拉伸該調整件組之第二調整件之二第二結合部各別與該第二伸縮布件之一第二黏扣部相結合；透過本創作藉由該護具具有貼附性佳的效果來貼附於大腿之股四頭肌及其周圍的肌肉，進而符合人體工學的設計，並可達到調整性能的目的。
