The seat cover adds coushin to your ride. Just slips right ofer your current seat and pull a string to tie it in place. And the multi tool has everything you need in it to fix anything on your bike or anywhere else. It has 16 function all in one tool:Socket Hex Wrench 8/9/10/mm,Slotted Screwdriver,Phillips Screwdriver,Socket Extension Rod,Solid Wrench 8/10/15/mm,Hex Key Wrench 2/2.5/3/4/5/6mm,Spoke Wrench. #rankboosterreview #Sponsored #Outtag https://www.amazon.com/Outtag-Bicycle-Cushion-Anti-Slip-Multi-Function/dp/B01IP3L59S