100% nylon. Side-release buckle with Carhartt logo engraved on front and gunmetal D ring. Adjustable. Sonic-welded seams are 80% stronger than stitched seams for maximum breakage protection. Carhartt embroidered logo on side. Sizes Small/Medium=3/4 inch collar with adjustable length of 12-18 inches, Large/XLarge 1 inch wide collar with adjustable length of 18-26 inches.