Dalvin Cook autographed memorabilia has been one of the hottest sellers in the NFL. This Dalvin Cook Autographed Minnesota Vikings Riddell Blaze Alternate Speed Mini Helmet - JSA Authentication has been hand signed by Vikings Rookie, Dalvin Cook and witnessed by James Spence Authentication (JSA). Your package will included a Certificate of Authenticity from JSA and matching tamper-evident sticker on the product. Dalvin Cook took the NFL by storm in 2017 and projects to have a great career with the Vikings. Shop with confidence as this Dalvin Cook signature is 100% authentic. Prime One Sports backs this product with our 100% Money Back Guarantee.