The Helly Hansen Chelsea Evolution 2.0 safety boot features an Ortholite X25 Hybrid Footbed that's lightweight, breathable, providing long lasting cushioning and moisture management. Helly Tech Waterproof Membrane. Dri Blaze Lining for additional warmth and comfort. Primaloft insulation - 400g. Moulded TPU toe bumper. Moulded heel overlay. YKK Zipper. Primaloft Gold Insulation. Composite safety toe. Metal free nail penetration protection Safety Rating: S7L CI FO HRO SR 200J Composite Toe Cap Composite Penetration-Resistant Midsole Standard Fit Oil-Repellent & Chemical-Resistant Sole Not Tested for Sole Heat Resistance Waterproof ESD Sole Shock-Absorbing Sole TPU Heel Guard Safety Rating: S7L CI FO HRO SR 200J Composite Toe Cap Composite Penetration-Resistant Midsole Standard Fit Oil-Repellent & Chemical-Resistant Sole Not Tested for Sole Heat Resistance Waterproof ESD Sole Shock-Absorbing Sole TPU Heel Guard