WP Full Grain Leather Soft, breathable nylon mesh lining. LEAP Technology footbed for tough comfort Soft, breathable nylon mesh sock lining with CLEANSPORT NXT pro-biotic odor control ReVive: Engineered Comfort Technology T1483 Cement construction Durable rubber outsole + SRX for extreme slip resistance.Technologies: CLEANSPORT NXT, LEAP Footbed, ReVive: Engineered Comfort Technology, SRX: Extreme Slip Resistance, Waterproof (WP), ASTM, Electrical Hazard (EH), Slip Resistant (SR) Cement Construction for durable yet lightweight feel SRX Slip-Resistant rubber outsole is abrasion resistant, performs against oil and water and provides best-in-class traction on slippery surfaces Comfort engineered to support your foot all day long