From East Bay roots to everyday fits, the New Era Athletics 19TWENTY Stacked Cap keeps your loyalty front and center. Crafted from 100% cotton, this baseball cap is soft, breathable, and built for all-day wear—whether you're watching the nine innings or cruising through the city. Rep the Oakland legacy with the New Era Athletics 19TWENTY Stacked Cap. Part of the 19TWENTY Stacked collection. 100% cotton.