Specialized Hyprviz Sl Pro Wind Vest Men Hyprviz SA gilet is arguably the most versatile piece of cycling clothing perfect for cool mornings, fast descents, and varying temperatures and the SL Pro Wind Gilet is no exception. Made from100% Recycled Polyester, it keeps you warm, but not overheated, and packs down to nearly nothing. Top if off with our HyprViz color treatment that increases your visibility to motorists, and you're left with a great option for nasty days. 100% recycled polyester wind