This is the C4 400 Foot Pockets PAIR for Spearfishing and Freediving Features: Manufactured in thermoplastic rubber and thanks to their unique design FOOT POCKET ANGLE: 3° SUITABLE FOR: All C4 blades model made for 300 and 400 foot pockets. They only weigh 390 grams. 400 are the lightest thermoplastic rubber foot pockets on the market today. The ergonomic design is typical of our C4 style. They feature a preformed angle of 3 degrees to enhance comfort and efficiency. The C4 400 Foot Pockets are the Lightest Rubber Footpockets on the Market. They are manufactured in thermoplastic rubber and thanks to their unique design they only weigh 390 grams. Very hydrodynamic even the junctions between the members and heel are designed to give continuity and fluidity to form.