Devices, apparatus and systems for preventing towels from slipping off a towel holder are disclosed. The apparatus, devices and systems may include a surface that provides a frictional interface between the towel and towel holder. Two opposing edges of such a device may each include at least one raised or enlarged attachment formation which, when the device is moved from an unraveled condition to an engaged condition, may be aligned and connected to effectively connect the edges to each other. Such a device may further include a plurality of friction formations configured to face and contact a towel and a plurality of ridges configured to face and contact a towel holder when the device is in an engaged condition, surrounding a towel holder and supporting a towel.