KA4200 Adult Size Posterior Walker.
Posterior Walkers have a frame that goes around the sides and rear of the user. The user is in the center of the walker. The front is open. It's a reverse-style walker that is excellent as a gait trainer.
The Wenzelite line of posterior safety walkers support the user from behind requiring them to stand in a more upright posture and also promotes trunk extension. Many physical therapists prefer posterior (reverse) walkers for children and adults with cerebral palsy and other neurological, orthopedic and developmental disorders.