This is the Lavacore Mens Backzip Full Jumpsuit Polytherm Scuba Diving, Snorkeling, Surfing Exposure Suit Features: Technically Advanced Fabric Constructed and Engineered Exclusively for Water Sports Ultimate in Thermal Control and Superior Comfort Unique Synthetic Construction Stretch and Movement of Traditional Lycia, Insulation Qualities of Neoprene Inner Layer: Soft Fleece for Warmth Middle Layer: Micro-Porous High Stretch Polyurethane (PU) Film Outer Layer: Lycia Knitted Nylon Wrap Knit Tricot Wet or Dry, Hot or Cold, Lavacore Controls Core Temperature Longer Great Warm-Water Suit Perfect for Layering Under Wet Suit for Added Warmth Wind-Proof Middle Layer Provides Anti-Wind Chill Properties Breathable Middle Layer allows Moisture to be Drawn-Away from Body on Surface Water Resistant Outer-Layer Facilitates Fast Water Run-Off and Quick Drying Light Weight and 4-Way Stretch makes Lavacore Incredibly Comfortable to Wear Neutrally Buoyant, Won&';t Effect Buoyancy Seams: Overlapped Flat-Lock Sewing, Decrease Water Flow Anti-Bacterial Inner Fleece, Minimizes Odor and Eliminates Bacteria Growth SPF 30+ Protection from Suns Harmful Rays Back Zipper Closure Lavacore is a technically advanced fabric, constructed and engineered exclusively for water sports requiring the ultimate in thermal control and superior comfort.