Boys size is 32cm/14inches long with velco closing at the back
Mens is regular adult size
The colours chosen suit lots of modern coloured mens clothing.
When styling pocket ties and squares, its better to mix and match within a colour range than to use the same colour pocket square and tie. Watch some gentlemen's gazette videos for more information. https://www.youtube.com/watch?v=gKwZt2eSAtI