The O'Neill HyperFreak Fire Series extends sessions in bone-chilling water with its next-gen TB4 Firewall neoprene, featuring graphene-infused, heat-retaining, durable fibers. Fluid Seam Welds and Fused Super Seal Cuffs ensure a watertight seal. TB4 and TB4X materials continue the HyperFreak legacy of unrivaled flexibility, warmth, and comfort. HyperFreak Fire is the ultimate in Fiery warmth. F.U.Z.E. Closure (Chest Zip) 360 degree Anti-Flush Barrier with Drainholes (F.U.Z.E.) Minimal Seam Design Fused Super Seal Wrist and Ankle Cuffs Recycled Oyster Shells and Eco Carbon Black Infused Neoprene Recycled Dope-Dyed Yarn Liners Aqua Alpha Solvent Free Neoprene Lamination Key Pocket with Loop Triple Glued and Blindstitched with Exterior Fluid Seam Weld Technology Front, Back, Thigh, Butt: TB4 Firewall Shoulder, Shin, Calf: TechnoButter 4 Entry, Sleeves: TechnoButter 4X PLUS (+) = 0.5mm Extra thickness for even more warmth | O'Neill Women's Hyperfreak Fire 4/3mm+ Chest Zip Full Wetsuit in Black, Size 10