The X-Wing Apnea freediving fins are also suitable for use in environments with rocks and boulders. The blade has a width of 19.0cm and a length of 69.3cm. The variable thickness of glass fibers allow high performance in kicking. The key features of X-Wing Apnea fins are: • Blade manufactured with pre-impregnated fiberglass layers • Blade with variable thickness and high performance parabolic deflection • The blade has a width of 19.0 cm and a length of 69.3 cm • High quality manufacturing process • New variable height side profiles support and optimize flexibility and channel thrust effect • Available with a soft or medium stiff blade • Longer fins, adapted to a medium kick width • Blue polygon design blade for better recognition in depth • 30° inclination of the blade from the foot pocket • Designed to be worn also without socks • Interchangeable blade