Indoor entrance mats for schools used in a surface use application should focus on retaining moisture. Indoor commercial entrance matting in schools should also be heavy duty and low profile. Most surface use entrance floor mats used in schools and colleges are "loosely laid" on the walk surface, but some heavy duty carpet mats and tiles are glued in place. Still others are aluminum roll-up school mats with beveled edging. Walk off matting used in schools get high levels of abuse so care should be taken to ensure that the mats are cleaned and inspected regularly to make certain that curled edging does not a trip and fall hazard.