This paper presents a non-linear multi-input control law using sliding mode concepts for continuous-time, uncertain systems. The control law introduces a cone-shaped layer around the sliding mode plane to remove chattering. This layer combines two types of boundary layers; a constant layer and a sector-shaped layer. The states will always enter the cone-shaped boundary layer and the choice of the sliding mode will be seen to determine the ultimate system performance. A numerical example is used to illustrate the results.