The flags were produced for the sport's governing body British Rowing and will be used during a series of events across the summer to promote attendance of the tournament.
The 2.4m-wide flags were printed on Dupont Artistry machines using knitted polyester by the 21-staff company, which also counts the likes of Selfridges, the BBC, Channel 4 and BA on its client roster.
Graham Wilkinson, managing director of the £2m-turnover company, said: "Feather flags are a striking, eye-catching and contemporary way of communicating and we are extremely pleased with the Junior Championship Feather Flags."
Hampshire Flag Company promotes international rowing event with feather flags
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Hampshire Flag Company has donated two feather flags to help promote Britain's hosting of the FISA World Rowing Junior Championships at Eton Dorney next year.