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Technology & Features

Performance
Premium performance headwear born from running so you feel lighter, freer, and ready to move. Stay comfortable in any condition and keep your momentum strong.

Quality
Durability you can count on. No sagging or fading, just headwear that keeps you confident and focused on feeling your best every day.

Endurance
Built to elevate your performance and your day the moment it goes on. Light, sharp comfort that lifts every movement and motivates you to keep going.

Style
Clean, versatile headwear that helps you feel good wherever you go. Look sharp on the run, feel confident through the day, and live your alter ego.
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Size Guide
| Size | Hat Size | Inches | CM |
|---|---|---|---|
| Small (S) | 6 ½ - 7 ⅛ | 20.5" - 22.4" | 52cm - 57cm |
| Most Popular STANDARD (Std.) |
6 ⅞ - 7 ½ | 21.7" - 23.6" | 55cm - 60cm |
| X-LARGE (XL) | 7 ⅛ - 7 ⅞ | 22.4" - 24.8" | 57cm - 63cm |
How to measure
To choose the right size, follow the steps below:
Use a measuring tape for maximum accuracy (flexible tape, if possible).
Make sure the measuring tape is positioned to where your hat will be wore and neither too tight nor loose.
Measure on bare skin / over hair similiar to how you would wear your hat.
Compare your head measurements to those on our size chart, and choose the size closest to yours.
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 | 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.
Love how this hat fits, phenomenal product to be honest! Just need more hats with this back strap and i’d buy 3 easy!
Literally just got delivered today and did a 6 mile run in it in the MS heat and absolutely LOVE it. Everything I was hoping for!!
Outstanding Performance & Style — Alter Ego Delivers Again!
I recently picked up the Alter Ego Running Coaster Splash in Tactical Black Green, and it has quickly become my go-to gear for both workouts and everyday wear. The design is sharp and modern — the black and green colorway strikes the perfect balance between rugged and stylish. Whether I’m on a trail run, hitting the gym, or just out on a casual day, this hat makes a statement without being loud.
What really stands out is comfort and support. Breathability is top-notch. Durability-wise, these are built like tanks. There is even a hidden key pocket in the hat. After a few weeks of heavy use, there's barely any sign of wear. You can tell Alter Ego puts serious thought into their materials and construction.
it was unbelievable thank you top of the line product