The Tagalong On-Seat Booster utilizes Safe-T-Core technology, a system of molded panels that fasten together permanently, creating a lightweight, yet super-strong structure, tested to 175 lbs. Unlike foam-based pet car seats, the On-Seat Booster will not trap odors – cleans easily to stay looking and smelling fresh. Adjustable safety leash included. Available in faux leather with sheepskin liner (Standard Version) or quilted microfiber with quilted plaid liner (Deluxe Version).