Ultraventure 4 Size:10 The MD500 is equipped with

The MD500 is equipped with a full-length FuelCell midsole that offers a propulsive feel perfect for racers striving to go faster

in every condition

The Birkenstock BirkoBalance Footbeds are constructed of Birkenstock's patented unique dense EVA foam based insert that is waterproof and does not absorb water

It has a new outsole for superior traction and a new Adaptive Cushioning Technology midsole for an even smoother ride

The lace lock system attaches to the shoe tongue

Ultraventure 4 Size:10 The MD500 is equipped withDiscover comfort worth sweating over with the fourth generation of Topo Athletic's best selling trail runner. Ultraventure 4's plush platform combines with their signature roomy toe box to deliver long lasting comfort, while the ZipFoam midsole offers lightweight response. Topo Athletic's Vibram XS Trek EVO outsole offers excellent multi surface traction, with a lug pattern and depth optimally designed for light to moderate trails and for easy trail