Blue Seventy Men's Helix Wetsuit - 2013 Reverse Zipper: quicker suit exit Buoyancy: 5-5-4, including buoyancy in torso for keeping the hips high and promoting an efficient downhill swimming position. A-Flex inner jersey is laminated to ultra supple 40 cell neoprene to produce an incredibly flexible suit. This A-Flex is also used in: 1mm arms, 1mm arm gussets, 1.5mm TST panels, and 2mm back panel #39 Yamamoto Neoprene Textured forearm print on jersey allows the swimmer extra feel for the water and additional grip in the propulsion phase of the stroke.