Second belly strap is super close to his *. All areas of contact are adjustable. Second strap lands geographically across my boys.
Small won't fit a jack russel. The back strap is inconvenient.
The fabric is such that he doesn't overheat when we are walking. Fits snug without being overbearing.
The velcro is good. The clips are sturdy. The rings for the leash is sturdy. It offers two different ways to control her- leash and a handle. The buckles are plastic, but they seem sturdy, and the vest as a whole seems well made.
Straps and adjusters are cheaply made plastic and don't hold your dog if he pulls!