This chest zip winter suit from Alder has FDL (Fast Dry Lining) on 70% of the inside, 100% of the outer nylon is "x" stretcha nd 95% of the seams are taped inside for a long lasting secure seam. This suit uses solvent free aqua alfa glue for a safer and healthier environment.  CONSTRUCTIONSEAMS: GLUED & BLINDSTITCHEDSEAMS: FULLY TAPED SEAMS INSIDEFABRIC: MAIN BODY - 5MM SURFLEX NEOPRENEFABRIC: ARMS/SHOULDERS - 4MM SURFLEX NEOPRENE FEATURESFAST DRY LINING INSIDE MAIN BODYFIRELINE LINING INSIDE ARMS & LEGS DURATECH KNEE PADSHIDDEN KEY LOOPPK PLASTIC ZIPAQUA ALPHA GLUEDOUBLE LINED THROUGHOUT“O” RINGS ON WRISTS & ANKLES