When your operation takes you in to the most rugged terrain, the Quest 4D Forces 2 gives you the support and grip of a mountain boot, but still has the flexibility to take a knee or sprint to the target in tough conditions. Outsole: Contagrip MD Midsole: Dual density midsole, EnergyCell Chassis: 4D Advanced Chassis Upper material: Anti-debris mesh, full grain leather, medial protective pad, non-reflective materials, protective mudguard, single layher mesh Upper Constuctions: Closed hooks, gusseted tongue, protective toecap, SensiFit Lining material: Mesh and textile lining Sockliner: Molded OrthoLite Lacing system: Lace locker, regular laces Anatomical fit: Standard Fit Norms and certifications: ISO 20347 : 2012 Closed seat (method ISO 20344 : 2011) A=Antistatic properties (method ISO 20344 : 2011) E= Heel energy absorption (method ISO 20344 : 2011) WRU=Water resistance upper (method ISO 20344 : 2011) P=Anti perforation sole (Determination of penetration force method ISO 20344 : 2011)