17" WIDE 10 DEGREE FULL CONTAINMENT SEAT WITH HEAD & SHOULD KIT & ALL BLACK COVERSKIRKEYS CONTAINMENT SEAT IS DESIGNED FOR THE SHORT TRACK RACER WHO WANTS THE ADDED SAFETY OF A CONTAINMENT SEAT AT A PRICE THEY CAN AFFORDCONSTRUCTED FROM TIG WELDED .100" THICK 5052 GRADE ALUMINUM. ADDITIONAL MIG WELDING ADDS STRENGTHCONTOURED ELONGATED BOTTOM FOR ADDED THIGH AND HIP SUPPORTRIGHT SIDE LEG EXTENSION BUILT IN, LEFT SIDE CUT BACK FOR EASY ENTRY, EXITDESIGNED TO ACCOMMODATE ALL HEAD AND NECK RESTRAINTSREINFORCED RIB AND SHOULDER RESTRAINTS HAVE EXTRA 1/2" ENERGY ABSORBING PADDING DIRECTLY ON THE SEATVERTICAL AND LATERAL ADJUSTABLE HEAD RESTRAINT USES MOLDED, HIGH DENSITY, ENERGY ABSORBING IMPACT PADS TO ELIMINATE UPHOLSTERYLEFT SIDE HEAD AND SHOULDER RESTRAINT IS SHORTENED TO ALLOW EASY ENTRY AND EXITLAP AND SUB-BELT OPENINGS HAVE MOLDED RUBBER GROMMETS TO ELIMINATE BELT WEARHOW TO MEASURE FOR A SEAT: IN THE SEATED POSITION, USING A STRAIGHT EDGE, MEASURE ACROSS THE HIPS AT THE WIDEST POINT. THIS MEASUREMENT IS THE WIDTH OF SEAT THAT YOU NEED