The citrusy colour of lime green is bright, positive and noticeable. The almost overwhelming amount of green is broken up by a window and a minimalistic tapered flap which keeps the envelope bright and attractive but also allows you to look at it for extended periods of time.
The envelope comes in a C4 size which is appropriate for the vast majority of letters that will ever be sent. What's not to like?
Supplied in a box of 250.
Matching A4 paper is also available.