The 2020 O'Neill Psycho Tech 5/4mm plus back zip wetsuit combines their exclusive TechnoButter 3 and added heat-generating TechnoButter Air-Firewall. Packed full with the hi-tech features you need to stay warm and toasty in any condition. 

O'Neill Womens Psycho Tech 5/4 B/Z features:

• Patented Z.E.N. Zip Closure (Back Zip)
  
• Redzone Water Resistant Zipper
  
• Anti-Flush Barrier
  
• Double Super Seal Neck
• Stitch-less Seam Technology
  
• Fluid Seam Weld
  
• Fully Taped TB3-X Seams
  
• Arms/ Shoulders/ Shins/ Calf: Technobutter 3
  
• Chest/ Back: Technobutter 3 Air-Firewall Smoothskin
  
• Thigh/ Butt: Technobutter 3 Firewall