Free Shipping to the United States! Keep yourself warm on your fat bike rides this winter with an embroidered performance beanie that fits under your mountain bike helmet. This beanie wicks moisture away and has a lightweight, sporty design. Each product is made to order and then shipped to your door.
Fit under most mountain bike style helmets
One Size Fits Most
Fits under my helmet
This hat fits nicely under my helmet. I tried it on just now. I have to size my helmet much larger, but it works. Not too bulky.