Material exterior: Cuero, Cierre: sin cordones Nautilus makes good safety toed shoes and I have worn Nautilus shoes for years without problems. I wear these for 12 1/2 hour days and they work well for a steel toe shoe Zapato Nautilus Cuero Grano Completo Nautilus 1631 Womens ESD Slip-On Safety Toe Work Shoe Black Leather No Calzado De Trabajo Antidescarga Nautilus 1631 Womens ESD Slip-On Safety Toe Work Shoe Black Leather No Metal FSI FOOTWEAR SPECIALTIES INTERNATIONAL NAUTILUS Nautilus 1670 ESD No Exposed Metal Safety Toe Oxford C50a60a1 4632 4e78 8bb1 F4830c2c490c.5416ed749977e6ec479a88dc1df4bdc0