Sometimes the kidlets need a leg up, and that's what this aptly named accessory does. Designed to help 4- to 7-year-old kids climb up onto the seat and rest their feet before their legs are long enough to reach the Sideloaders. - Compatible with Mundo V4 and V5s, V4s frame sets, and elMundo BionX - Easy to install with an Allen wrench size 5 - Includes hardware - Yuba 2-Year Warranty