Though it’s been less than a year since its official launch, Whistles' men's collection has landed some pretty solid collaborations, including one with Swedish raincoat specialists Stutterheim

This week, the London-based brand dropped another must-have collaborative line, this time in partnership with Ebbets Field Flannels, the purveyor of vintage crafted athletic-wear.

As shown in the images below, the two-piece collection is comprised of unisex baseball caps that blend Whistles’ contemporary style with Ebbets’ throwback aesthetic. The classic six-panel designs are available in navy and ecru with contrast piping, and co-branding details. But the best part of this collection is that all the profits will go towards Treckstock, a charity dedicated to young people with cancer.

So if you’re looking to add a couple more snapbacks to your wardrobe—and want to give back to a good cause—you should definitely check these bad boys out. They’re available today at Whistles' online store