Mat Attachment

FIG. 1 is a perspective view of a mat attachment; FIG. 2 is a right side view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a front view thereof; FIG. 5 is a rear view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; and, FIG. 8 is a top, perspective view of the mat attachment coupled to a mat that is laid flat. All broken lines of FIGS. 1 - 7 represent unclaimed features of the article to which the design is applied. The broken line showing of the mat of FIG. 8 is for the purpose of illustrating environmental structure and forms no part of the claimed design.