FORCEFIELD BACK PROTECTOR PRO SUB 4 (SIZE MEDIUM) THE WORLDS BEST BACK PROTECTION JUST GOT BETTER!! More flexible, non-restrictive and comfortable. This is what the professional riders trust! Designed to withstand greater impacts than any other back protector. World's First Motorcycle Back Protector to transmit 4kN in CE test EN1621-2:2003 (Level 2) Size Medium: Torso Length 16 3/4"  18 1/4" inches (generally for riders 5'9 - 6 feet tall)