01 — What you know
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Your t-shirts size in Nike
An M in one brand is an L in another — and oversized cuts shift it again.
02 — Your Under Armour size
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Pick a size you wear in another brand, or enter your chest. Your Under Armour size appears here.
03 — The chart
Under Armour t-shirts & polos
Under Armour's t-shirts & poloschart isn't on file yet — sizes above are estimated from other brands.