Quantum Hybrid Zip/Lace Composite Toe Work Boots 5" - CedarDescription Engineered with hybrid safety, each step fights fatigue and maximises energy rebound, whether on the worksite, the warehouse or anywhere in between. The Cordura collar wraps the ankle for added protection and comfort, with D30 built into the medial and lateral acting as a shock absorber for high impact resistance. Kulkote heat mitigating technology coats the NatureTex linings, absorbing heat energy to create a cooling effect. Quantum is