Crispi's Attiva is the go-to option for hunters and hikers who want to stay nimble, mobile, and agile while simultaneously keeping their feet dry and protected. The upper is made from a combination of premium leather and synthetic materials to keep the boots light and durable. The Elastoflex midsole and Vibram outsole delivers a perfect weight to impact absorption ratio for greater comfort during long hikes. The Board Lasting Mechanical Construction achieves the perfect connection between torsion rigidity and flexibility thanks to a mechanical process that wraps the comfortable and soft part of the upper to the insole frame. The Attiva also features Crispi's proprietary Thermo Wire Technology to promote greater stability, ankle support, and protection without any unnecessary weight. Additionally, the Attiva utilizes a speed lacing system with a lace garage on the top of the tongue to keep the laces tidy. Features of the Attiva Boots: Leather & synthetic upperElastoflex midsoleVibram outsoleBoard Lasting Mechanical ConstructionThermo Wire Technology Crispi Men's Attiva Black/Grey Shoes 1910-9960 in Gray/black, 11D