Use a measuring tape for maximum accuracy (flexible tape, if possible).
Measure where the hat will sit, with the tape snug but not too tight.
Measure on bare skin or over your hair, similar to how the hat is worn.
Match your measurement to the closest size on our chart.
Size Guide
Size Guide
Size
chest
waist
XS (0-2)
31-34"
79-86 cm
25-27"
64-69 cm
S (4-6)
34-37"
86-94 cm
28-30"
71-76 cm
M (8-10)
38-41"
97-104 cm
31-33"
79-84 cm
L (12-14)
42-45"
107-114 cm
34-36"
86-91 cm
XL (16-18)
46-49"
117-124 cm
37-39"
94-99 cm
XXL (20-22)
50-53"
127-135 cm
40-42"
102-107 cm
How to measure
To choose the right size, follow the steps below:
Use a measuring tape for maximum accuracy (flexible tape, if possible).
Measure your chest
Wrap the measuring tape around the fullest part of your chest, just under the arms and across the
shoulder blades. Keep it horizontal and snug, but not tight.
Measure your waist
Find the narrowest part of your torso, just above the belly button. Wrap the tape around your waist
comfortably, leaving space for one finger.
Compare your chest and waist measurements to those on our size chart, and select the size that most
closely matches your measurements for the best fit.
Size Guide
Size Guide
Size
hips
waist
XS (0-2)
34-36"
86-91 cm
24-26"
24-26"
S (4-6)
36-38"
91-97 cm
28-30"
71-76 cm
M (8-10)
38-40"
97-102 cm
30-32"
76-81 cm
L (12-14)
40-42"
102-107 cm
34-36"
86-91 cm
XL (16-18)
42-44"
107-112 cm
38-40"
97-102 cm
XXL (20-22)
44-46"
112-117 cm
40-42"
102-107 cm
How to measure
To choose the right size, follow the steps below:
Use a measuring tape for maximum accuracy (flexible tape, if possible).
Measure your hips
Stand with your feet together and wrap the tape around the fullest part of your hips, keeping it level
and snug but not tight.
Measure your waist
Measure your waist at the narrowest part, usually just above the belly button. Wrap the tape snugly
around your waist, leaving a finger's width for comfort.
Compare your hips and waist measurements to those on our size chart, and select the size that most
closely matches your measurements for the best fit.
Running Hats for Women Built Around How You Actually Run
Every detail of our women’s running hats is thoughtfully designed. Every hat here is selected for the fit, function, sizing, and performance features women runners consistently look for: ...
Every detail of our women’s running hats is thoughtfully designed. Every hat here is selected for the fit, function, sizing, and performance features women runners consistently look for: ponytail-friendly construction, UV protection, effective sweat control, small sizing options, and a silhouette that holds up across every kind of run.
Whether you're pacing a summer 10K, grinding trail miles in full sun, or squeezing in a pre-dawn interval session, the right hat makes a measurable difference. Here's what every style in this collection brings to the run:
HyperPoly+™ moisture-wicking fabric that pulls sweat away fast and prevents the white residue lines that ruin most caps after a few long efforts
AER Splash™ water-repellent finish so the hat sheds rain and heavy sweat without becoming waterlogged
UV-protective construction with structured brims designed to shield your face and eyes during sun-heavy training days
Vented rear panels that push airflow through the hat exactly when conditions heat up
Adjustable snapback closure for a secure, personalized fit across different head sizes and hairstyles without shifting mid-stride
Reflective detailing on all styles for added visibility during early morning and low-light runs
Packable, collapsible build on Cruiser Fit styles that fold flat and spring back to shape on demand
For women's running hats with ponytail openings, our PonyVent Collection is purpose-built with a rear opening that lets your ponytail or bun sit naturally without pushing the hat forward or breaking the fit.
From race day to recovery runs, every hat in this collection is built to show up the same way you do - consistent, reliable, and ready for whatever the run brings.
Commonly Asked Questions
The non-negotiables are moisture-wicking fabric, breathable panels, a secure, adjustable fit, and a brim that provides real sun coverage. Bonus features worth looking for include reflective accents for low-light safety and packable construction for travel and race days. All Alter Ego women's running hats cover the essentials as a baseline.
Our PonyVent Collection is built specifically for this. It features a rear opening that accommodates ponytails, high buns, and braids without distorting the fit or pushing the hat forward during your run.
Yes. Alter Ego offers Small sizing with a narrower circumference and shallower crown depth. The adjustable snapback also allows fine-tuning within each size. Use our Hat Fit Guide to find your exact measurement before ordering.
For heat and humidity, the Visor Fit delivers open-top airflow with no crown coverage, adding heat. The Cruiser Fit is a close second: unstructured, quick-dry, and featherweight. Compare both in the Visor Fit Collection and Cruiser Fit styles.
Yes. Many styles are designed with UV-conscious design and structured brims that help provide reliable sun coverage during long outdoor efforts and race days. Check individual product pages for specific details on coverage and features.
Yes. The Cruiser Fit collapses flat into a bag or pocket and returns to its original shape when you pull it out. It's built for runners who travel light and want a reliable hat without taking up space in their kit.
Yes. The snapback closure provides a secure, adjustable fit that stays consistent throughout your run. For fast-paced efforts, structured styles like the Trotter Fit are a great option, and you can easily fine-tune the snapback for your preferred fit before heading out.
The core fabric across the collection is HyperPoly+™, a performance material that wicks moisture, resists staining, and holds its shape through repeated use. Structured fits reinforce the front panel with foam; packable styles keep the construction fully flexible throughout. All feature breathable rear venting.
Match your hat to how and where you run:
Hot weather or high humidity: Visor or Cruiser Fit
Daily training and all-purpose use: Coaster or Trotter Fit
Ponytail or bun: PonyVent Collection
Low-light or early morning runs: look for reflective detailing
Smaller head size: filter for Small sizing
Style preference: Many women like to match their hat with their outfit for a coordinated look and feel
Meet the coaster fit, our modern interpretation of a timeless classic.
Shop the look
Meet the coaster fit, our modern interpretation of a timeless classic.
Shop the look
Introducing the trotter fit, our modern interpretation of a classic hat that is sure to impress.
Shop the look
Elevate your running game with the cruiser fit - a premium, unstructured running hat that looks and feels fast, while The drifter fit was designed with modern style in mind, featuring a horizontal shape and flat brim that offer a sleek and contemporary look.
Running Hats for Women
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