Thorogood's VGS Tactical Uniform Boots make use of a state-of-the-art Visible Gel System (VGS) cushion. The visible gel heel unit provides comfort by absorbing shock and reducing repetitive impact stress, protecting the foot and transmitting less stress to the knees and hips. The gel won't deflate like airbag units and is tested to withstand 300 pounds per square inch. For added comfort, a Motion Sensor two-density, memory foam-covered, removable footbed cradles the entire foot. Other features include a breathable moisture-wicking lining, lightweight EVA midsole, and high-traction rubber outsole. Thorogood's full-grain leather VGS boot comes in eight-inch and six-inch side-zip waterproof/bloodborne pathogen compliant and eight-inch side-zip non-waterproof versions.