This Siren Sport GTX sounds the alarm when the weather turns bad and keeps pace with the worst it throws out. A mesh upper backed by a Gore Tex highly breathable XCR membrane provides complete waterproof protection and comfort. QForm triple density EVA midsole for cushioning, support, and stride alignment. Molded nylon arch shank for support under the arch. Vibram TC5 rubber outsole with 5 mm lugs for excellent wetdry traction. Gore Tex XCR membrane for highly breathable waterproof protection. Synthetic leather and mesh upper for durable wear and breathability. Air Cushion in the heel absorbs shock and adds stability. OrthoLite anatomical footbeds wick moisture, add cushion, and neutralize odor. Stroebel construction offers flexibility and comfort. Bellows tongue keeps debris out. Lining treated with Aegis antimicrobial to inhibit odor.