A removable back protector is included which can also be worn separately if desired

or whatever buzzword you can name

Retention System: There is no dial-type retention system with this helmet

the X-SYNC 2 design reduces friction and the accumulation of mud

OneUp Components Dropper Post V1 Rebuild Kit eBay A removable back protector isThis kit includes all the parts required to rebuild your V1 Dropper Post. Replacement Seal Upper and lower bushings Anti rotation pins Compatible with V1 Dropper Post ONLY. If your V1 OneUp dropper is slow to extend, chances are that this may be caused by low air pressure. Please make sure to check this first and do so with the post fully extended. Proper air pressure is 280 300psi at full extension. The valve is located under the top clamp. If you