Reebok Clay Matthews Green Bay Packers White Authentic Jersey Size 50 All letters, numbers & team logos sewn & stitched onto jersey 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) Single- or multiple-layer dyed tackle twill or fabric player name and number Officially licensed