This variant of the hands-free leash is only appropriate for non-running/pulling dogs, like shy or elderly small & medium dogs, not something I would walk a German Shepherd or even Beagle size dog with, personally, for the sake of my shoulder. 
Edward, founder @ petCINC

Size: 5.3-7.9ft-Medium
Color: Black
Brand: WANFIRE
Material: Polyester fiber, nylon, aerospace aluminum alloy
Product Dimensions: 95"L x 0.98"W
🐶🦮【Excellent After-Sales Support - We're Always Here for You】Includes: 1 black dog leash. Our customer service team is ready to answer any questions or concerns. We offer 12 months of product warranty. Please contact us promptly if any issues arise.
🐶🦮【Hands-Free Dog Leash – Wear It Your Way】The dog leash length ranges from 5.3-7.9ft (63-95 inches), and the dog leash can be replaced with "crossbody dog leash, waist dog leash or handheld dog leash" according to your needs. Flexible functional changes can enhance various interactions between you and your pet.
🐶🦮【Heavy-Duty & Built to Last – Up to 110lbs Support】The weight of the waist dog leash is about 260g, which can support dog weights up to 110lbs/50Kg. Made of nylon and polyester fibers, it has high-strength tear resistance and long-lasting durability. The 360° rotating lock is made of aerospace aluminum alloy to prevent breakage. The maximum tensile strength is 196kgf, ensuring freedom of movement while preventing the risk of leash breakage and losing the dog.
🐶🦮【Dual Padded Handles for Maximum Comfort & Control】Both handles feature soft neoprene foam padding, reducing strain on your waist and hands. Ideal for active dogs, the leash absorbs shocks and impacts, offering maximum comfort even during long walks or runs.
🐶🦮【2-in-1 Dog Car Seatbelt – Travel Safely】Equipped with a car safety buckle, this leash easily connects to your car’s seatbelt socket. It keeps your dog secure and stable during car rides, reducing travel anxiety and ensuring pet safety on the go.
🐶🦮【Reflective Design for Nighttime Safety】Featuring double-sided reflective tape, this leash enhances visibility in low-light conditions. Whether you're out for a night run, an early morning walk, or an evening stroll, it provides an extra layer of safety for you and your dog.
 From Daylight to Moonlight – Walk Safely Anytime! 
 About our products 
 5.3-7.9 ft 
 Adjustable length 
 4.6-6.6 ft 
 240g 
 Wight 
 680g 
 Detachable 
 Two handles for use 
 Reflective strips 
 196+kgf 
 Lock load-bearing 
 250+kgf 
 400+kgf 
 Nylon belt load 
 400+kgf 
 5.3-7.9 ft 
 Adjustable length 
 5.9-9.2 ft 
 240g 
 Wight 
 330g 
 Detachable 
 Two handles for use 
 Reflective strips 
 196+kgf 
 Lock load-bearing 
 250+kgf 
 400+kgf 
 Nylon belt load 
 400+kgf 
 5.3-7.9 ft 
 Adjustable length 
 5.9-9.5 ft 
 240g 
 Wight 
 300g 
 Detachable 
 Two handles for use 
 Reflective strips 
 196+kgf 
 Lock load-bearing 
 250+kgf 
 400+kgf 
 Nylon belt load 
 400+kgf 
 5.3-7.9 ft 
 Adjustable length 
 5.9-9.5