Soft stretch poly base, woven nylon straps, and coated carbon steel D-rings Harnesses With NEW Neck Buckle (Moss, Orchid, Limeade, and IM❤︎WO Only): New launches feature an additional neck buckle for maximum adjustability, easier on and off, and a better fit for most breeds. Sizing has changed slightly with this new design, so please refer to the measurements below for the best fit: XS: Neck = 10"-11", Chest = 13"-16"