The Nautilus Spark CT is a work shoe designed to help you work smart, not hard. Carbon nanofiber safety toe cap meets or exceeds ASTM F2413-18 I/75 C/75 (Impact/Compression) and EH (Electrical Hazard) safety standards. Traditional lace-up closure. Textile or leather upper. Lining and insole made of textile material. Removable dual density insole. No exposed metal and security friendly. A padded tongue and collar reduces skin irritation. EVA cushion midsole absorbs impact and provides rebounding with every step. Memory foam Strobel cushion is paired with a double cushion insole for superior comfort. Slip-resistant rubber outsole meets Mark II Oily/Wet Coefficient of Friction .58 standard. Imported.