PROBLEM TO BE SOLVED: To enable mass production, which can be easily mounted on an elastic body used on a bed or a sofa, and which allows the user to easily move and adjust the position to a position where the user can actually suppress and suppress the occurrence of physical condition such as low back pain. An elastic repulsion adjusting device is provided. SOLUTION: This is a sheet for covering an elastic body such as a bed or a sofa, and a plurality of plain weave fabrics, in which the entire portion of the elastic body covering the body loading surface is made of fibers having an elongation rate of less than 20%, Sheets to be a fabric multi-layer body in which the warp threads of the cloth are laminated at different angles so that the warp threads do not have the same direction, and are integrated by adhesion [selection diagram] FIG.【課題】ベッドやソファで使用する弾性体に容易に装着でき、使用者が腰痛等身体不調の発生の抑制と程度の抑制を実感できる位置に、使用者自身が手軽に移動調整できる量産可能な弾性体反発調整装置を提供する。【解決手段】ベッドやソファ等の弾性体を被覆するシーツであって、該弾性体の身体載荷面を被覆する部分全体が、伸び率２０％未満の繊維からなる複数の平織の布帛を、該布帛のそれぞれの経糸の方向が揃わないよう、互いの経糸同士の方向を異なる角度にして積層し接着により一体化した布帛複層体とするシーツ【選択図】図７
