The Gul Response 4/3 mm Back Zip Wetsuit in Black is Gul\'s best selling wetsuit. The Response is long lasting, durable and flexible. A fantastic combination of value for money and performance. They are constructed with glued and blindstitched seams plus 100% X-Flex super stretch neoprene. Product Information:• Product Code: RE1248S21-BKBK• Blindstitched seam construction.• X-Flex 150% super stretch main body.• FX:LITE silky smooth hydrophobic layer.• S-Lock easy entry back zip system.• PK Blackout waterproof zip.• Powertex4 knees for flexibility and durability.• Revo Fit 3D pattern technology.• G-Tape inner waterproof X-Flex taping fuses seams together for additional reinforcement.• Mesh chest and back to prevent wind chill.• Titanium 2 reflects heat back in.• Non-petroleum based neoprene.