Dura-Tech Ballistic nylon is sewn in just the right spot to keep your knees from damaging the seat cover This product can be used with Model Part# Yamaha YZ250F 03-05 BSCY-1 Yamaha YZ450F 03-05 BSCY-1 Yamaha YZ125 Tall 02-07 BSCY-2 Yamaha YZ250 Tall 02-07 BSCY-2 Yamaha YZ250F-426F Tall 98-02 BSCY-3 Yamaha YZ250F Tall 03-05 BSCY-4 Yamaha YZ450F Tall 03-05 BSCY-4 Yamaha WR250-426 Tall 98-02 BSCY-5 Yamaha YZ125 02-07 BSCY-6 Yamaha YZ250 02-07 BSCY-6