CONFORMS TO EN ISO 20345:2011 S3 M HRO WRU SRC UPPER Durable full grain leather upper. Enhanced durability and breathability Scanner safe non-metallic composite hardware. Extra protection Triple stitched main panels. Better build quality, prevents breakage TECH Fast wicking lining. Moisture management and comfort Poron XRD™ Flexible Internal Metatarsal Protection. Industrial protection Hardwearing protective TPU toe guard and moulded heel support. Protection from underfoot penetration SOLE PU high density midsole. Long lasting support Contour moulded Magnum PU footbed. Underfoot cushioning and comfort SRC SRA Heel 0.36, SRA Flat 0.39, SRB Heel 0.15, SRB Flat 0.18