Red Bull Formula 1 F1 baseball hat cap. Good condition. This hat is from 2016 when Max Verstappen and Daniel Ricciardo were teammates. Measurements included in photos. There is no adjustment in the back. The size is in the photos, indication a small/medium size, but my head is on the bigger side and it still fit :) unisex fit. Lando Norris Lewis Hamilton Sebastian Vettel Ayrton Senna Charles Leclerc Carlos Sainz Oscar Piastri George Russell Nico Rosberg Kimi Raikkonen