The Furnace Synergy Series delivers lightweight, premium heat and innovative technology with superior value. Lined with ultra warm Furnace quick dry, the double knit jersey creates air pockets that trap heat and allow for optimal drainage. A Superlight Foam core provides 250% stretch with excellent thermal retention, and a Superflex 250 Jersey tops it off for added insulation and low water absorption. Created with clean, contoured seams and optional color blocked panels, the Furnace Synergy delivers everything you demand from a premium wetsuit, without breaking the bank. Womens Wetsuit. 4/3 Fullsuit. Back Zip. Furnace Quick Dry Lining at font and back: large front and back seamless panels of a new double knit Furnace jersey creating pockets of air trapping body heat, as well as allowing it to drain and dry ultra fast. Superlight Foam Core: made from upcycled car tires, the light weight, high stretch foam core offers excellent thermal retention.