PETER GRIMM ONE SIZE (OS)
All Peter Grimm hats are designed with our exclusive One Size Stretch Fit elastic sweatband for a flexible, comfortable fit that adapts to most head sizes.
Hats with specific sizes follow the Peter Grimm Hat Size Chart below.
If your hat (either sized or one size) still feels too big, use the included Peter Grimm Sizing Tape to customize your fit.
Need more sizing tape? Just give us a call - we've got you covered!

HOW TO MEASURE
1. Grab a Tape Measure
Use a soft measuring tape. If you don't have one, use a piece of string and measure it against a ruler.
2. Measure Your Head
Wrap the tape around your head, just above your ears and eyebrows, where your hat will sit. Keep it level and snug, but not tight.
3. Find Your Size
Compare your measurement to the size chart above to find your best fit.
BETWEEN SIZES?
If you're between sizes, we recommend sizing up for comfort.
Our One Size Stretch Fit
Our One Size Stretch Fit sweatband offers flexibility for most head sizes.
PETER GRIMM SIZING TAPE
Included with every hat. Made to help you customize your fit.
HOW TO USE
- Peel off the backing from the sizing tape.
- Place the tape underneath the sweatband at the front, back, or sides of the hat where a tighter fit is needed.
- Add additional pieces as needed until you achieve a comfortable, secure fit.
NEED MORE SIZING TAPE OR HELP?
We're here to help! Call us at (800) 664-4287 and we'll make it right.