This is the Tilos 1mm Proto-Skin Metalite Coated Jumpsuit Scuba Diving Wetsuit features: 100% MetaLite coating on entire suit MetaLite coating "reflects" warmth back to the body, increasing heat retention Retains as much as 2mm ~ 3mm suit Dries faster than standard neoprene as the MetaLite lining naturally sheds water Allows you to feel dry and warm, even after your second dive Adjustable Velcro collar Back key pocket Flat-Stitched throughout Back YKK metal zipper head PVC knee protector and ankle stirrups The Proto-skin Collection of wetsuits use a 1mm Metalite coated suit that improves heat retention so that this 1mm suit provides warmth similar to a 2mm or 3mm suit! Great for use in warmer waters or as a liner suit if additional warmth is needed.