Hey Snowpoul13,
As Daye and DonnyDivine have mentioned, New Running Boots will give the player a 75% walking speed boost when worn; however, the boots can traverse approximately 2000 blocks before breaking and turning back into Old Running Boots. I would also agree with Donny that investing in Thunder Stone Armor is much more efficient than constantly creating New Running Boots as they will give you Haste and Speed. If you have any other questions or concerns, please feel free to let us know on our forums or by creating a ticket in the #help-and-support channel of our Discord!
Cheers!