All Profoto Softboxes have a recessed front that allows you to attach a softgrid. The Profoto Softgrid 3x4 Feet Rectangular reduces the light spread to 50 degrees. In other words, it creates a more directed light and eliminates a large amount of spill light, allowing you to shape the light with even more precision. It has hook-and-loop attachments for fast and easy setup. By limiting the spread of light, a softgrid can help to create more contrast in your images, resulting in a more dramatic and moodier look. Regarding reducing unwanted spill light, it is especially useful when you need to avoid illuminating the background or surrounding areas. The Softgrid is made with premium fabrics and is delivered in a labeled soft pouch. Compatible with the Profoto Softbox line. It cannot be used with the RFi, OCF, and Clic Softbox ranges.