This is the C4 Mustang Foot Pockets PAIR for Spearfishing Free Diving Fins Features: Newest Compression Molding Technology Multi Compound Construction for Comfort and Fit Omer Sub&';s Interchangeable Foot Pockets Internal Geometry of the Foot Pocket Ergonomically Designed Designed Using Beta Tools Used in Production of Safety Shoes Fits-with-Total Comfort Maximize-the-Efficiency of the Stroke without Compromising Comfort Size: US 6-7 (EUR 39-40) Sold as Pair Omer Sub&';s Interchangeable Foot Pockets were designed and developed by Omer&';s Technicians using the Newest Compression Molding Technology that exists today.