Reebok Alex Smith San Francisco 49ers Red Authentic Jersey Size 50 Body: 100% 6-oz polyester pro brite, diamond back, or stretchaire mesh (varies by team) Sleeves/Yoke: 100% 6-oz polyester metallic plus dazzle, duratalic, or lycratalic (varies by team) Collar/Cuffs/Sleeve Inserts: 100% 10-oz polyester rib knit (specific to team) NFL Equipment patch sewn on the bottom of front collar or fabric insert Officially licensed