Abstract: An improved tire-slip preventing device consisting of a plurality of cross belts arranged across a pair of parallel cords in the form of a ladder is constructed so that one end of every other cross belt can be detached from the associated cord. The detachable end of every other cross belt is attached to the associated cord after the device has been wrapped about the tire, whereby a very tight fit between the tire and the device can be easily obtained. The last cross belt at one end is made detachable or otherwise one of the cords is provided at an intermediate portion thereof with a separable link, thus permitting the device to be wrapped about the tire without raising the vehicle or driving it onto the device.