The MARES Avanti Superchannel FF Yellow fins in size 40/41 feature a blade length between 32 and 37 cm and a closed, orthopedic foot pocket designed for comfort and versatility. The thermoplastic rubber foot pocket fits barefoot or with neoprene socks, with a shape that wraps the instep and heel, featuring differential thickness edges for durability. The blade, primarily made of elastic yet soft Tecralene material, incorporates Channel Thrust technology to enhance performance, making these fins suitable for both recreational diving and snorkeling with medium-high efficiency.