hydrogen action jacket neoprenNeoprene jacket for maximum warmth that is reminiscent of our Racer Jacket but in a shorter model with more uses. Paddle SUP or kayak with this jacket. Open it up if you get too hot, neoprene protects against wind and cold water. Prolimit Specification. Our light weight racer jacket. Made from PU coated fabric, plush lining, for maximum warmth, shorter model than our racer jacket. Deep pockets to warm your hands Hook pocket for use with spreader bar