New model for this year (Do not check this option if this model was listed as new in last year's Gear Guide)Waterproof version of the award winning Sparks. 29% recycled polyester mesh, 40% recycled synthetic leather. Lace and webbing is 100% Ecosensor recycled polyester. Midsole has EcoPure EVA additive to promote degradation in landfill conditions. 25% recycled rubber outsole.