This Autographed Powder Blue Pro Style Jersey has been Personally Signed by Keenan Allen of the Los Angeles Chargers. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by JSA Witness. This is a JSA Witnessed Protection Program item which means a JSA representative was present when this item was being signed. The authenticity can be verified on JSA website. This is a X-Large sized Jersey.