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 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.
The Insulated Hats Collection is designed for anyone who wants the warmth of a winter hat with the look of a classic baseball cap. On the outside, these insulated hats look like your favo...
The Insulated Hats Collection is designed for anyone who wants the warmth of a winter hat with the look of a classic baseball cap. On the outside, these insulated hats look like your favorite snapback, but inside, they feature hidden warmth to keep you comfortable when the temperature drops. Whether you are logging frosty morning miles, spectating at winter races, or just commuting in style, our thermal hats and insulated performance caps deliver warmth, function, and Alter Ego’s clean aesthetic.
Product Features
Insulated snapback and baseball-cap styles for a classic look with hidden warmth
Breathable, moisture-wicking linings to manage sweat during cold-weather workouts
Lightweight warmth that layers easily for training, travel, or daily wear
Durable construction to handle repeated use in tough winter conditions
Adjustable snapbacks for a secure, personalized fit across head sizes
Versatile design that transitions seamlessly from outdoor performance to everyday style
Available in men's thermal hats and unisex fits for athletes who demand both performance and style
Brand Story
At Alter Ego, we set out to design cold-weather gear that performs as well as it looks. As brothers who built this brand from scratch, we knew runners and athletes wanted more than bulky winter gear — they wanted thermal hats and insulated caps that could move from workouts to daily life without compromise. This collection delivers premium materials, tested durability, and a look that fits your lifestyle all winter long.
Winter Performance & Everyday Versatility
For performance, our insulated hats and mens thermal hats keep you warm on cold runs, outdoor workouts, and early-morning training sessions while staying breathable. For everyday wear, they provide the style of a classic cap with the comfort of hidden insulation, making them ideal for commuting, weekend outings, or watching the game in crisp weather.
Cold Weather Insulated Hats FAQs
Yes. Our insulated performance hats and thermal hats are lined to trap heat while remaining breathable, making them perfect for winter training and daily wear in cold conditions.
Definitely. They’re designed with moisture-wicking insulation, so you stay dry and comfortable even during tough workouts or long runs in the cold.
Yes. Every insulated snapback hat features an adjustable closure for a secure fit, and we offer Small and X-Large sizes with different circumferences and crown depths.
Skip the washing machine. A quick rinse in cool water and air dry is all you need to maintain their shape and insulation.
Unlike most winter gear, our hats combine the look of a baseball cap with the hidden warmth of insulation. You already love our performance hats for training — these bring that same comfort and style into cold-weather conditions.
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.
