Polaris RZR XP4 Turbo UHMW A-Arm Guards . Factory UTV RZR XP4 Turbo a-arm guards offer the best in a-arm protection. Constructed from ultra tough and slippery 3/8 in UHMW these guards protects your a-arms from the off road abuse you love to put them through. These are an easy bolt on item with all hardware included. This is the same protection Factory UTV Support racers have used to protect their race UTV’s and win every major Pro UTV Endurance Championship race including the Baja 500, Mint 400, King of Hammers, San Felipe 250 and Silver State 300.