Rip Curl Heatseeker Womens Zip Free 4/3mm Wetsuit - Black The Women\'s Heatseeker Zip Free 4/3mm is Rip Curl\'s most technically advanced cold water wetsuit ever. Featuring heat generating materials, Flex Energy is a revolutionary neoprene that generates heat when stretched. As you move through the water, the lining will activate and heat your wetsuit. E5 Flash Lining gives two engineered layers that funnel water rapidly out of the suit once it is hung. The warmest and most comfortable lining available. Super quick drying and superior design provide the ultimate cold water wetsuit. Feature FLEX ENERGY A revolutionary neoprene that generates heat when stretched.  As you move through the water, the Flex Energy lining will activate and heat your wetsuit.  Stay active, stay warm. LIQUID MESH Superior stretch smooth mesh panels that absorb solar heat and reduce wind chill. THERMO SHIELD Removes wind chill from the arms and provides increased durability to smooth neoprene. E6 FLASH LINING E6 Flash Lining has an incredible 20% more stretch than E5 Flash Lining and further improved drying properties. Ultimate warmth, stretch and comfort. ZIP FREE ENTRY Offers light, unrestricted performance and efficient design for maximum stretch, warmth and comfort. E6 NEOPRENE All new super high stretch performance neoprene that surpasses industry standards. 25% more stretch and 15% lighter than E5. 3/4 FLASH LINING TAPE 25% More stretch, faster drying time, lighter tape.Temperature Guide: