O'Neill Wetsuits Mens 6/5/4 mm Heat Fluid Seam Weld Full Suit Neoprene Should fit snug, but not too tight 6/5mm 100% UltraFlex DS Neoprene for the Ultimate fit, function, and flexibility Exterior Fluid Seam Weld Construction to lock out water from coming inside the suit Strategic Seamless Paddle Zone UltraFlex Firewall Interior Chest and Lumbar Code Red Urethane Coated Back Zip to keep water out