The Mares Quattro Power Full Foot Dive Fin offers all the performance of the world renowned Avanti Quattro without booties. Warm water divers appreciate the full foot comfort and freedom while experiencing the power of Mares Channel Thrust Technology. Popular with freedivers as well. The 4 channels cup and deliver thrust efficiency. Details: Channel Thrust Technology system for optimal water channeling Ideal for warm water Foot pocket is molded for maximum comfort Maintaining optimal thrust throughout every phase of the finning stroke minimizes fatigue COLOR: Black Comes in three sizes: 6.5 to 7.5; 8/9; and 9.5 to 10.5