With all the elements of the tried-and-tested and popular Niggeloh welding collar, supplemented by a highly stable quick-release fastener. A pull (size S & M) or push (size XS) on the quick-release fastener opens the collar and releases the dog. WITHOUT disturbing him! 3 sizes: XS (adjustment range 30 to 40 cm), width: 4.8 cm, weight: 94 grams, S (adjustment range 40 to 50 cm), width: 5.5 cm, weight: 189 grams, M (adjustment range 48 to 60 cm), width: 5.5 cm, weight: 193 grams Matching: The TRAIL ULTRA welding strap.