In order to meet the requirement for Height Adjustable Desk (Sit-Stand Desk) use, we improve the material of anti-fatigue mat to be more durable to withstand chair casters. It makes our height adjustable desk mat (sit-stand desk mat) will not damage easily by rolling a chair over it. The height adjustable desk mat (sit-stand desk mat) is also designed with 20 degrees bevel edge that not only can reduce trip hazard but also can easily roll the chair onto the mat. Our Height Adjustable Desk Mat (Sit-Stand Desk Mat) is a professional anti-fatigue mat when you are standing at work.