Astral Men's Porter Outdoor Shoe for Boat, Water, Casual, and Travel Rubber The Porter is a classic boat shoe made with modern materials and designed for high performance. The outsole is made with G.15 high-friction rubber with razor siping and maximum surface contact. The uppers are made of hydrophobic canvas with 2 mm Airmesh at the tongue and vamp for ventilation. Features a slit at the heel for debris drainage, a nylon liner, and water-resistant laces. Weighs 250 g and fits true to size.