The Ruffwear Knot-a-Leash is super resistant, made with kernmantle rope and climbing mosqueton. This type of rope has a core and a lining that optimizes strength, offers durability and flexibility. The strap offers visibility in low light conditions as it contains reflective fabric throughout and around the rope. The carabiner is strong and has a manual safety, comfortable fabric, easy to grip and sturdy, small loop under the handle for accessories or collection bags.