T-shirts, compression shirts, padded shirts, and flak jackets are all viable options for clothes to wear under pads for football.
Parts of a Football Uniform - SportsRec
New shoulder pads help make game safer for King QB
Under Armour Mens Gameday Armor IntegratedPadded Football Girdle in Girdles.
Under Armour Mens Gameday Armor IntegratedPadded Football Girdle, Girdles - Canada
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What to Wear Under Pads for Football - SportsRec
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How To Put On Pads for Football
shirt under football shoulder pads
Rules for Field Goal Kicking & Pads in High School Football
shirt under football shoulder pads
Gameday Armor Integrated Football Pant -White, AS