Navy Square Plaid Bike Helmet patterns A mathematically delightful helmet featuring

A mathematically delightful helmet featuring a gray background and black shapes filled in at randomized intersections (kind of the two-color map theorem)

whether it's on your desk or on a side street

Portland Airport's iconic carpet design

A minimalistic design featuring simple black shapes on an off-yellow background (or let us know if you'd like a different color background)

A helmet painted to look like a worn pair of jeans

Navy Square Plaid Bike Helmet patterns A mathematically delightful helmet featuringA simple, elegant, and dashing design for the everyday commute. A helmet you can wear to work. This helmet is hand painted with acrylics and ink in our studio. It's also coated with a UV protected varnish, making its surface scratch and water resistant. Each helmet comes with adjustable foam padding for the perfect fit. The S M fits head circumferences 21" 22. 75" and the L XL fits head circumferences 23" 24. 75".