The X-Stream Fins are engineered for efficient finning and superior performance in all diving conditions. A riddled foot pocket prevents drag and the channel shape gives more thrust for less effort. The blade's soft long inserts allow a controlled deformation while kicking creating less turbulence. Minimize fatigue and maximize a fluid movement through the water with a pivoting blade that maintains an optimal angle throughout the kicking cycle. Thermoplastic materials offer maximum elasticity, durability and longevity.Weight: 1 1/2lb.Material: Thermoplastic rubber/TechnopolymersTwo year limited warrantySizesXSSRXLBlade Length13 5/8"14 3/16"14 5/8"15"