Even those without well-trained legs will find the lightweight Cressi Maui Adjustable Fins easy to use. Dual-material technology used for the blade creates 2 rigid lateral wings that direct the flow of water to the central section, where a softer and more elastic material makes it more flexible. The flexing blade creates a spoon-like effect generating considerable propulsive force. The grab handle for fitting the fin wraps around the ankle to reduce protrusion and avoid chafing while swimming. Cleat on the elastic strap easily adjusts to ensure the foot is held firmly in place without excessive pressure. The fin can be worn with bare feet or light socks. Soft, anatomical rubber heel piece. Durable fabric covering on the EBS strap. Dual-material technology for ease of use 2 rigid lateral Flexing blade generates considerable propulsive force Adjustable cleat on the elastic strap Soft, anatomical rubber heel piece Durable fabric covering on EBS strap