Xcel Infiniti 4/3mm Back Zip Men\'s Wetsuit 2020 REFLECTED INTERNAL HEAT DISTRIBUTION THE INFINITI LTD COMBINES THE BEST OF THE INFINITI SERIES WITH XCEL’S NEWEST TECHNOLOGIES: CHANNEL FLEX AND RADIANT REBOUND. THIS LATEST ADVANCEMENT UTILIZES A METAL LINING UNDER THE TEXTILE THAT BLOCKS COLD TEMPERATURES FROM PENETRATING THE OUTER LAYER AND REFLECTS HEAT GENERATED WITHIN THE WETSUIT BACK TOWARDS THE BODY, KEEPING YOU IN A CONSTANT STATE OF WARMTH. FEATURES CHANNEL FLEX – WEIGHTLESS, UNRESTRICTED STRETCH RADIANT REBOUND – WEIGHTLESS, UNRESTRICTED STRETCH NANOPRENE LITE JAPANESE LIMESTONE – LIGHTER, SOFTER, WARMER GLIDE SKIN COLLAR – PREVENTS FLUSHING CURVED BACK ZIP WITH FULL BACK DAM ENGINEERED FIT SYSTEM – FITS LIKE A SECOND SKIN BACK KNEE FLEX GROOVES – PREVENTS BUNCHING FUSIONX TAPE – HEAT-PRESSURE BONDED SEAM PROTECTION NEXSKIN WRIST SEAL – MINIMIZES FLUSHING WATER BASED GLUE