The Heat is stuffed with high-end features and materials and as it implies, is all about keeping in the heat. With added Technobutter for flexibility and durability, fully taped and glued seams, and a smoothie front and back, this wetsuit is thoroughly designed for warmth. Lined with Firewall to keep the heat inside, it is O'Neill's version of a toaster wetsuit. This is the perfect suit for our friends that find themselves always cold in the water.