Recessed Front Design: All Profoto Softboxes feature a recessed front allowing attachment of a mask for creative lighting effects and the Velcro attachment secures the mask Contour and Catch Light: Attaching the Edge Mask creates a completely dark center producing beautiful contour light around the subject and adding an intriguing catch light for enhanced visual appeal Frame of Light Effect: Positioning the Softbox with Edge Mask behind the subject results in a frame of light illuminating the edges and creates a captivating visual with a black background Eliminates Hot Spots: Designed to eliminate hot spots in the lighting and the high-quality fabrics ensures even and controlled illumination as it enhances the overall quality of the captured images Compatibility and Limitations: Compatible with Profoto Softbox line not suitable for RFi, OCF, and Clic Softbox ranges it ensures proper usage within the specified product range