Oneill Heat 4/3mm Back ZipProduct Description The Heat wetsuit is loaded with premium features and built using exclusive TechnoButter 3 neoprene20% lighter with 30% less water absorption than standard high end materials. The result is a suit that feels incredibly light, dries faster, and performs at a high level in a wide range of conditions. TechnoButter 3 Firewall lining in the chest and back boosts warmth while maintaining exceptional flexibility. Combined with Fluid Seam