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To put on the Reflective Harness, your dog's head and left front leg go through the openings, the strap with the buckle comes up behind the right front leg, snap the buckle and you're set! There's no pressure on the neck, and the leash ring is behind the shoulder blades. The snap buckle, or Bucklebone (a registered design) is super-easy to clasp and undo.
And at night, all the bones in the design reflect any light around - street lights or car headlights.