This underliner is certainly NON slip. The actual height of the underliner is accurate as what is advertised- almost too high, as it will show between the carpet and underliner. However, I only ordered a 4’x6’ for my 8’x10’ carpet. Reason being, we have our sectional couch on the carpet and the underliner is only to place under the ottoman. I will cut the edge of underliner on some sort of angle so you shouldn’t notice the slight “ ramp” Once the carpet is down.