Bought it for my wife to put under her chair while she works at her sowing machine. Just today she told me the edge sticks up (presumably from the weight of her sitting on her chair) and one time not realizing the edge was sticking up she caught her toe on it (ouch). Shudda paid more for the better one.
Mat is thinner than I thought and sags a little where my chair wheels sit making it a little difficult to move about. Mat is still helpful office desk/chair sits on indoor/outdoor carpet. Will buy a heavier mat when this one needs replacing.