Mares Flexa Core can be used as a stand-alone product. Completes the family of Flexa suits as an additional layer for your Flexa steamer. Integrated hood with zipper: the zipper direction means it will not overlap with your Flexa steamer zipper when used as an additional layer. 100% Ultrastretch neoprene, mostly in 3 mm, with strategic 4 mm inserts on the torso and back where thermal comfort is needed the most. Glideskin seals on the thighs and arms prevent water entry. Shoulder grip area for better comfort when wearing a BCD.