Insoles made with Bloom Algae technology use sustainable algae biomass without compromising durability or comfort Feet sweat and trails get muddy. Thats why Oboz created the B-DRY waterproof system which lets sweat escape and keeps moisture out. Built partially from recycled materials Dual-density EVA midsole with gender-specific tuning Bozeman outsole is grippy on the trails or around town Built from recycled and durable materials, the Bozeman Mid Leather Waterproof features a winterized combo of waterproof nubuck leather that's been oiled to be less susceptible to salt and water stains winters in Bozeman can be known for.