The Radium Curv 13 features ION's revolutionary thermo composite CURV material known for a light weight and great durability. With a flex index of 13, all loads are distributed perfectly through its stiff 3D pre-shaped center part. Together with the high outline, this medium stiff to stiff harness supports the rider exactly where needed. Flexible side parts allow great freedom of movement for radical moves on the water. On top, the C_Bar 2.0 upgrades the Radium Curv 13 even further and contributes to its light weight thanks to its composite design.