The Mariners have already raised a hair-raising amount this Movember - but two staff members are set to go the extra mile on Wednesday.
The club's operations director, Carl Mowatt, and head of media and communications, Daniel Prince, are to run 13 miles in aid of men's health.
They will set off from the Harton and Westoe Miners' Welfare Ground at 6am on Wednesday, running to Sunderland AFC's Stadium of Light before turning back and eventually ending at 1st Cloud Arena.
The figure of 13 miles was chosen to represent the 13 men who take their own life in the UK each day.
Leading men's health charity Movember prioritises funding for mental health and suicide prevention, as well as prostate cancer and testicular cancer.
Carl and Dan are among several club employees and volunteers to have taken part in Movember to raise awareness and funds for men's health by growing a moustache during Movember.
They have been joined by office colleagues Harry Duwell and Jonathan Rose, as well as club chairman Geoff Thompson, historian Steve Cairns and players Tom Broadbent and Luke James.
Dan said: "Movember is a brilliant initiative which targets the three biggest health issues facing men, and both the club and Foundation were extremely keen to support it this year.
"This is just one last push from Carl and I to raise awareness further and hopefully gain a little more exposure for Movember, as well as raise more funds for the charity.
"I'm sure it's going to be a cold one and it isn't going to be easy, but it will all be worth it for such an excellent cause.
"We're hugely grateful for the support we have all received so far and although times are difficult for everyone, if anyone is able to spare anything for a donation it would be massively appreciated by us all.
"I'm sure everyone involved agrees though that we can't wait until December 1st so we can finally get rid of the horrific facial hair!"