The Jr. Hinge features a light weight construction with 4 way stretch Flex-Span poly fabric to keep you moving. The Speed Skin panels leave the extra water behind as you accelerate. Inside their Stretch-Light lining fabric surrounds you in comfort. It has a 12 panel design to allow you freedom of movement. The 4 shoulders panels are specifically placed to keep your shoulders moving. The split sides and solid back panel design provide even back support without being stiff. Made with the best PVX and PVE flotation foams. Both are US Coast Guard approved lab tested and certified for low water absorption and long life. The stretchable PVX foam compound makes this vest extra comfortable secure and safe! While the Extra light PVE foam provides extra flotation. Designed to deliver locked in security with a wide range of motion. Wide arm openings and narrow shoulders lets you move in comfort. Fully turned seams are smooth and comfortable.