Under Armour Boy's Threadborne Siro Tank;
Under Armour Boy's Threadborne Siro Tank

Thread borne Siro gives greater stretch & recovery, ultra-soft feel & more breathable performance. Moisture Transport System wicks sweat & dries fast. Anti-odor technology prevents the growth of odor-causing microbes.

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Thread borne Siro gives greater stretch & recovery, ultra-soft feel & more breathable performance. Moisture Transport System wicks sweat & dries fast. Anti-odor technology prevents the growth of odor-causing microbes.

  • Quick drying TPU strap
  • Ultra cushioned comfort that's great for the beach or the street
  • Sold in whole sizes only
  • Quick drying TPU strap
  • Ultra cushioned comfort that's great for the beach or the street
  • Sold in whole sizes only

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