The invention relates to a device, esepcially for stabili­zing soil material, comprising a substantially elongated web (l) which in mounted position on a support (4) forms a plurality of cells or pockets. For the purpose of providing a device which can be manufactured from inexpensive raw ma­terial, which possibly can easily decompose, and which can be manufactured in accordance with a simple and preferably known process, and at the same time render a minimum tran­sport volume, and which in connection with soil stabilizing provides favourable anchoring in the ground which is to be soil stabilized, and which forms pockets or cells having walls extending vertically independent of the slope angle of the ground for stabilizing the soil even during heavy rain, it is according to the invention suggested that the web (l) is constituted by an initially relatively thin, substantially flat web (l), preferably of flexible plas­tics, which in a first direction is provided with rows of consecutively arranged slits (2,2a, 2b) which are so stag­gerd relative to each other that the web (l) by the stret­ching thereof in a second direction forms oppositely undu­lating strips (3a,3b,3c) which upon mounting of the web on a more or less inclined hill define side by side arranged cells or pockets (8) which can be filled with soil (9) be­ing stabilized by the device. Due to the sharp lower edges (l0) of the undulating strips (3a,3b,3c) the device (l) in stretched condition will easily be pressed down into the ground (4) for the anchoring thereof in the ground (4), and the various degrees of stretching can be harmonized to the various angles of inclination of the ground on which the device is to be carried.