The 6" Northbound Waterproof Insulated boot from our Classic 2.0 series brings you a new, improved favorite from our archives, with premium waterproof leather plus an Ortholite insert and 400g Thinsulate for comfort that endures. This boot meets ASTM F2892 safety footwear standards. The 6" Northbound Waterproof Insulated boot from our Classic 2.0 series brings you a new, improved favorite from our archives, with premium waterproof leather plus an Ortholite insert and 400g Thinsulate for comfort that endures. This boot meets ASTM F2892 safety footwear standards. The 6" Northbound Waterproof Insulated boot from our Classic 2.0 series brings you a new, improved favorite from our archives, with premium waterproof leather plus an Ortholite insert and 400g Thinsulate for comfort that endures. This boot meets ASTM F2892 safety footwear standards.