Hat Performance
A hat can do far more than finish an outfit -- it manages heat, sweat, sun and wind. This hub explains the performance properties that separate a technical cap or beanie from a purely decorative one, so you can choose for the conditions.
Temperature
Breathability
How freely a hat lets heat and moisture escape from the head.
What it is
Breathability measures how well a fabric or mesh vents warm, damp air away from the scalp.
Why it matters
A breathable cap prevents overheating and sweat build-up in warm weather or during exercise.
Insulation
A hat's ability to trap warm air and hold body heat in the cold.
What it is
Insulation comes from thick or lofted fabric, wool crimp or fleece that traps a layer of warm air near the head.
Why it matters
As a large amount of body heat is lost through the head, an insulating beanie is one of the most efficient ways to stay warm.
Comfort in motion
Moisture Wicking
Fabric that pulls sweat off the brow and spreads it to dry quickly.
What it is
Moisture-wicking fabric moves sweat away from the skin to the outer surface where it evaporates faster.
Who it benefits
Runners and gym-goers benefit most, as a wicking cap or sweatband keeps sweat out of the eyes.
Weather protection
UV Protection
A hat's ability to shade skin from the sun's ultraviolet rays.
What it is
Brimmed hats and tightly woven fabrics block UV, some rated with a UPF value for measured sun protection.
Best for
Bucket, boonie and sun hats give the widest UV cover for holidays, hiking and time on the water.
Wind Resistance
How well a hat blocks chilling wind from reaching the head and ears.
What it is
Wind resistance comes from dense knits, woven shells or membranes that stop air passing through the fabric.
Why it matters
A wind-resistant beanie keeps warmth in on exposed hills and cold commutes where a loose knit would let cold through.
Water Resistance
A finish or fabric that sheds light rain to keep the head dry.
What it is
Water resistance uses a durable water-repellent finish or a tight technical weave so rain beads and runs off.
Best for
It suits outdoor and running caps used in changeable weather, keeping a shower off your face and glasses.
Comfort in motion
Lightweight Construction
A minimal-weight build you barely notice through a run or a hike.
What it is
Lightweight caps use thin technical fabrics and stripped-back construction to cut grams without losing function.
Who it suits
It suits runners and hikers who want shade and sweat control without any noticeable weight or bulk.
Stretch
Give in the fabric or band so a hat flexes to the head and stays put.
What it is
Stretch comes from elastane in the band or an elasticated knit that flexes to grip a range of head sizes.
Why it matters
It gives a secure, comfortable fit with no adjuster on show, ideal for active and stretch-fit caps.
Frequently asked questions
Do you really lose most of your body heat through your head?
You lose heat from any uncovered area, and the head is often the largest exposed part in cold weather, so an insulating beanie is one of the most effective single garments for staying warm outdoors.
What makes a good running cap?
A good running cap is lightweight and breathable with a moisture-wicking sweatband to keep sweat from the eyes, and often a water-repellent finish for changeable weather.
What does UPF mean on a sun hat?
UPF, or Ultraviolet Protection Factor, rates how much of the sun's UV a fabric blocks; a higher UPF and a wider brim give better protection for skin on the face and neck.