Iridescent Collection
Size Guide
| Size | Hat Size | Inches | CM |
|---|---|---|---|
| SMALL | 6 ½ - 7 ⅛ | 20.5" - 22.4" | 52cm - 57cm |
| STANDARD | 6 ⅞ - 7 ½ | 21.7" - 23.6" | 55cm - 60cm |
| X-LARGE | 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).
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 | 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.




































Iridescent Running Hats That Move With Light, Speed, and Style
The Alter Ego Iridescent Hats Collection is designed for runners who want performance gear that stands out in motion. Inspired by shifting light, reflective surfaces, and color-changing finishes, these iridescent running hats bring a dynamic visual edge to every run.
Whether you're training at sunrise, pushing through night miles, or simply looking for a bold statement piece that still performs under pressure, these hats are built to move with you and react with light.
Each design transforms depending on angle, lighting, and movement, creating a subtle holographic effect that makes every run feel different.
What Makes Iridescent Hats Different?
Unlike standard performance caps, iridescent hats combine visual movement with technical function. The finish reflects and shifts color based on light exposure, giving each hat a unique dynamic appearance without compromising performance.
Every hat in the collection is built with Alter Ego’s core running technology:
- Iridescent reflective finish: Shifts color depending on light and movement for a dynamic visual effect
- AER Splash™ water-repellent technology: Helps water bead off during rain and sweat-heavy runs
- HyperPoly+™ performance fabric: Helps resist sweat stains and keeps color clarity intact
- Moisture-wicking interior: Pulls sweat away from the skin for long-distance comfort
- Breathable ventilation panels: Enhances airflow during high-intensity activity
- Lightweight structured build: Holds shape without adding weight or pressure
- Adjustable snapback closure: Secure fit for all head shapes and hair types
- Reflective visibility support: Helps improve visibility in low-light conditions
- Durable color retention: Maintains iridescent finish through repeated use
- Easy care design: Hand rinse cold and air dry only
Built Across Performance Fits
The Iridescent Collection is available across multiple Alter Ego silhouettes, allowing runners to choose their preferred structure without sacrificing design.
Available fits include:
- Coaster Fit: Balanced structured crown with curved, moldable brim
- Drifter Fit: High-depth structured crown with bold flat brim aesthetic
- Cruiser Pro Fit: Lightweight, unstructured design for speed and comfort
- Trotter Fit: Classic athletic shape with everyday versatility
Each fit brings a different expression of the iridescent finish, from subtle glow shifts to bold reflective statements.
Who Are Iridescent Hats Made For?
These hats are designed for runners and athletes who want performance gear that stands out visually while performing under real conditions.
Ideal for:
- Night running and low-light training
- Road and trail running
- Gym and fitness sessions
- Athleisure and lifestyle wear
- Runners who prefer bold, standout aesthetics
- Festival, travel, and streetwear styling
- Everyday performance use
The collection is unisex and built for men and women, with adjustable sizing across most styles including Standard and X-Large options.
Visibility Meets Performance
While the iridescent finish enhances visual presence, the core function remains performance-first. These are not fashion-only hats, they are engineered for movement, sweat, weather shifts, and long training sessions.
The reflective nature of the material also adds a subtle visibility advantage during early morning and evening runs, making them practical as well as visually distinct.
Explore More Alter Ego Fits
Looking for a different performance profile?
- Browse the full Alter Ego Hats Collection
- Compare fits in the Hat Fit Guide
- Explore structured vs unstructured options across Coaster, Drifter, Cruiser, and Trotter lines
- Check the XL Hats Collection for extended sizing options
Iridescent hats are performance caps with a light-reactive finish that changes appearance depending on angle and lighting. At Alter Ego, they are built on sweat-wicking, breathable running hat structures.
Yes. These hats are designed for running with lightweight construction, moisture control, ventilation, and adjustable fit. The iridescent finish does not affect performance functionality.
Yes, the reflective finish helps enhance visibility in low-light environments such as early morning or night runs, adding a subtle safety advantage.
Yes. The Iridescent Collection is unisex and designed to fit all runners with adjustable closures and multiple sizing options.
Hand rinse using cold water, gently clean sweat areas with a soft cloth, reshape the brim, and air dry naturally. Avoid machine washing or heat drying.
They combine a color-shifting iridescent finish with performance-grade materials like AER Splash™ water resistance, HyperPoly+™ fabric, and breathable sweat-wicking construction.
Yes. They are designed for both performance and lifestyle use, making them suitable for running, travel, gym wear, and everyday outfits.





