The second martingale style is the Loop Martingale. This is a more traditional martingale design with a loop of nylon webbing with no adjustment slide as in the Keeper Style martingale. Because there is no adjustment slide, we can include matching ribbon on the loop. Loop style martingales can be ordered with and without a snap buckle. If you order a collar without a snap buckle, be sure that it will slide over the widest part of the dog's head. All slip style (limited slip, martingale, etc.) collars should be measured the same way that you would measure for a prong collar. See the video here for how to measure.