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    • Curved Brim
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    Coaster

    Performance snapback

    Trotter

    Low Profile

    Drifter

    Modern Flat Brim

    Cruiser

    Classic Running Hat

    Traveler

    Unstructured Build

    Visor

    Open Top

    Beanie

    Performance Knit

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Trending now:

Interior and front view of a white Alter Ego Running performance hat showing blue camo brim lining, perforated panels, and a blue palm tree logo.
Coaster Splash White Navy Camo
$49
Interior and front view of a black Alter Ego Running hat showing camo brim lining, polka dot interior, and tonal American flag patch.
Coaster Splash Black Silver Flag
$49
Trotter Splash White Silver Flag
Trotter Splash White Silver Flag
$49
Interior and front view of the Coaster Splash White USA Flag performance hat featuring a raised American flag patch, blue brim, red underbill, perforated crown, and moisture-wicking sweatband
Coaster Splash RWB Flag
$49
Interior and front view of the Coaster Splash Glacier White Silver Flag performance hat featuring a raised silver American flag patch, grey camo underbill, perforated crown, and moisture-wicking sweatband.
Coaster Splash White Silver Flag Snow Camo
$49
Coaster Splash Navy Camo Palm
Coaster Splash Navy Camo Palm
$49
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Size Guide

Hat Size Guide

Size Hat Size Inches CM
X-Small 6 ¼ - 6 ⅞ 19.6" - 21.7" 50 - 55
Small 6 ½ - 7 ⅛ 20.5" - 22.4" 52 - 57
Most Popular Standard 6 ⅞ - 7 ½ 21.7" - 23.6" 55 - 60
X-Large 7 ⅛ - 7 ⅞ 22.4" - 24.8" 57 - 63
All Alter Ego hats feature an adjustable closure for a personalized fit.

How to Measure Your Hat Size

To choose the right size, follow the steps below:

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.

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Shop the look

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.

Alter Ego Running

Our mission is to create the best, highest-performing headwear on the planet, built to help you unlock and live your Alter Ego.

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  • Custom Hats
  • Find a Retailer
  • Contact Us
  • Race and Party
  • Our Blog
  • Become a Retailer
  • Retailer Log-in
  • Careers
  • Returns / Exchanges
  • Order Tracking
  • Military
  • Teachers & First Responders
  • FAQs
  • Shipping
  • Terms of Service
  • Privacy Policy

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Size Guide

Hat Size Guide

Size Hat Size Inches CM
X-Small 6 ¼ - 6 ⅞ 19.6" - 21.7" 50 - 55
Small 6 ½ - 7 ⅛ 20.5" - 22.4" 52 - 57
Most Popular Standard 6 ⅞ - 7 ½ 21.7" - 23.6" 55 - 60
X-Large 7 ⅛ - 7 ⅞ 22.4" - 24.8" 57 - 63
All Alter Ego hats feature an adjustable closure for a personalized fit.

How to Measure Your Hat Size

To choose the right size, follow the steps below:

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.

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