Tether straps are an important safety feature of rear facing seats and limit the huge rebound forces. Replace the straps if damaged or lost. Get a second pair of straps for your second vehicle or while traveling. These dark grey straps will fit Britax Hi-Way, Britax Max-Way (after Oct. 2016), Britax Two-Way and Britax Multi Tech. If you have a Britax Max-Way produced before October 2106 you need a different kind of straps with a hook at one end https://www.carseat.se/product/tether-straps-for-max-way/.