Opposable thumbs let us do a lot of cool things. Rule over all the animals on the planet, climb to the top of the food chain, even invent the bicycle. And now they´re helping us kill it on the trail. This hydraulic lockout offers completely sealed and dependable lockout control through the click of an easy-to-reach button that can be triggered with a single thumb press. Press on to unlock, press again to lock. it´s just that easy. So next time you´re on the trail, remember everything those thumbs have done for you.