Power-Flex Neo/Speed Skin - The VORTEX vest is designed for powerful riders that need support. Our Speed Skin Neo Panel allows the VORTEX to quickly shed water as you get up to speed. Inside our Stretch-Light lining fabric surrounds you in comfortFlex-Architecture - The VORTEX CGA has a 6 panel flexing design with a unique back panel flex joint. Split sides and chest flex panels allow the VORTEX to move with you. Back panel design provides back support without restricting your movementPVX Foam - The VORTEX CGA vest is made with our best PVX flotation foam. US Coast Guard Approved foam is lab tested and certified for low water absorption and long life. The stretchable PVX foam compound makes this vest extra comfortable, secure and safe!Smart Fit - The VORTEX CGA is 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 Size Chart Chest Measurements:S = 34" - 36"M = 36" - 40"L = 40" - 44"XL = 44" - 48"2XL = 48" - 52"