IST S7-5 5MM Titanium Spandex Lined Boots (Men's 4, Women's 5.5)These boots feature a 5mm neoprene construction with a titanium lining that enhances heat retention, keeping your feet warm in colder water temperatures. The spandex lining adds an extra layer of comfort and insulation, ensuring a snug and comfortable fit. The titanium lining also helps to reduce water absorption, keeping your feet dry and preventing heat loss. The boots are reinforced with durable rubber soles, providing excellent traction and grip