Titanium coated top to be used as a first or second layer for extra warmth and protection. The 1.5mm outer shield Metalite lining reflects heat from the body to act as thermal insulation. This function regulates your temperature depending on the weather. Metalite vs. Neoprene is personal preference. The flexible and lightweight Metalite stays light when wet due to DWR technology, which includes a water resistant layer. Perfect top to combine with the Metalite long or short pant and best to be used for wet sailing in spring and fall.