Knit shirts with a band collar and a button placket were originally worn as underwear. Then English rowers in the town of Henley-on-Thames, preferring the increased ventilation, started wearing them as uniforms in their regattas-hence the name.  Over the decades they remained as sportswear until the 1970’s when their popularity took off.  
 
Longsleeve three-button henley.
Colours:  Navy, Powder Blue, Gold.
66% bamboo/28% cotton/6% spandex.
Made in Canada