Part of the BioLite Series. Flexible and lightweight, the Womenâ€s Spark Flex V-Back gives you all of the safety, comfort and performance you could ask for. With multiple hinges and the V-Back stretch panel, this vest provides unsurpassed mobility; accommodating any change in position that you make. Featuring the full front zipper and two concealed, adjustable belts that are there to keep things snug and make sure you get the most out of your life jacket. This life jacket incorporates BioLite technology making it lighter, breathable and more environmentally friendly than neoprene.