2015 was Nicky Hayden’s last full season in MotoGP – he raced a Honda RC213V-RS under Aspar Racing with Eugene Laverty as a teammate. Per the seller, these are the boots Nicky rode in the Catalunya Grand Prix that year with a special design specific for that race.
They are visible in this video from one of the practice sessions:
Find these boots for sale in Madrid, Spain with bidding up to $1,250 (the seller estimates shipping to the US will be approximately $60) here on Iconic Motorbike Auctions.
Disclosure: Bike-urious is a partner in Iconic Motorbike Auctions.