Insta Dry Hooded Vest This 5/3mm vest layers easily and the superior insulating power of Insta Dry neoprene makes it feel warmer than other vests of the same thickness. Insta Dry also has great memory, and resists the compression that comes from repeated exposure to diving depths. Wear it for several dives, and this amazing vest will begin to conform to your unique body shape. This custom-like fit is very comfortable and, along with the anti-microbial interior, helps provide a seal to prevent heat loss through water exchange.