The Puma Safety 630527 Sierra Nevada Black zip sided boot incorporates a waterproof breathable membrane, making this a fully waterproof work boot. The upper is made of water repellent waxed premium leather and has a drawn-up scuff cap in the toe area to reduce leather abrasion when working on knees. This model has a lightweight fibreglass toe cap and contains a shock absorbing GelCell in the heel for the wearer’s comfort. As with all styles from the Scuff cap range, the Sierra Nevada Black is Electrical Hazard rated for greater protection against electrical shock for those operating in higher risk work environments.