Use your ski pole to switch this durable binding to the more efficient touring mode (instead of your toe pivoting in the binding, the binding pivots with your foot). 3.7 lbs; bdel.com
Bonus: Choose from three compression-spring cartridges of varying stiffness (binding comes with one; pay $56 each for extras).
Bummer: Even the softest cartridge might be too heavy-duty for some skiers.