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    Coaster Fit

    Modern Look, Classic Vibe

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    Timeless Style with a Fresh Edge

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    Clean Lines, Confident Look

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    Ultra-Light, Built for Speed

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    Reliable Style, Everyday Ease

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    Everyday Warmth, Elevated Feel

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  • Coaster Fit

    Modern Look, Classic Vibe

    Trotter Fit

    Timeless Style with a Fresh Edge

    Drifter Fit

    Clean Lines, Confident Look

    Cruiser Fit

    Ultra-Light, Built for Speed

    Traveler Fit

    Laid-Back Style for Any Adventure

    Visor Fit

    Reliable Style, Everyday Ease

    Beanies

    Everyday Warmth, Elevated Feel

    shop all hats
  • Paint Splatter Collection

    usa collection

    Rewind Collection

    Rebel Collection

    Summit Collection

    Boneyard Collection

    Safari Collection

    Iridescent Collection

    Tactical Collection

    View All collections
  • outerwear

    tank tops

    Shirts

    Socks

    Hat Cases / Bags

    E-Gift Cards

    View All apparel
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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 Alter Ego Athletes

Alter Ego Athletes

From Basketball to Running and Coaching; An Interview with Bryan Botma (@thepacepusher)
Nov 18, 2019
From Basketball to Running and Coaching; An Interview with Bryan Botma (@thepacepusher)
Got Dared to Run and was Hooked; An Interview with Robert (@running_fatass)
Nov 15, 2019
Got Dared to Run and was Hooked; An Interview with Robert (@running_fatass)
Parenting, Traveling, and Running; An Interview with Brook Z (@mamabrookeruns365)
Oct 23, 2019
Parenting, Traveling, and Running; An Interview with Brook Z (@mamabrookeruns365)
Courage Over Comfort; An Interview with The Flippins
Jun 01, 2019
Courage Over Comfort; An Interview with The Flippins
Dream Big; An Interview with Bam Garcia
Mar 07, 2019
Dream Big; An Interview with Bam Garcia
Keep Showing Up; An Interview with Kimberlie McBride
Mar 02, 2019
Keep Showing Up; An Interview with Kimberlie McBride
Run with Heart; An Interview with Anthony Crivello
Feb 24, 2019
Run with Heart; An Interview with Anthony Crivello
Previous 1 2

Stay In The Loop

@alteregorunning

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.

  • About Us
  • 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

© 2026 Alter Ego Running | All rights reserved.

Alter Ego Athletes

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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