Ultraventure 4 Size:10 The Birkenstock BirkoBalance Footbeds are

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

100% recycled breathable mesh upper

The lace lock system attaches to the shoe tongue

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

plastic bottles

Ultraventure 4 Size:10 The Birkenstock BirkoBalance Footbeds areDiscover 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