Living up to its Ultimate name, the Rip Curl Ultimate G-Bomb Back-Zip LS Spring Wetsuit uses E7 and E6 neoprene in its thermo lining for a little bit of extra warmth and plenty of stretch in mild waters.. This spring suit features 2mm-thick construction and seams sealed with E6 tape for long-lasting performance that helps keep us out in the waves well after the crowds have gone home. Plus, the back zip stays out of the way for comfort when paddling out into the lineup.