The Rip Curl Trad Back Zip 4/3 is a 4/3mm wetsuit with a back zip for easy on and off. It is made from flexible E3 neoprene for good mobility and comfort, with E4 thermo lining for extra warmth in colder waters. GB seams contribute to a tight construction, and taped stress points increase durability. An internal key pocket provides convenient storage during your surf session