ProActive Soft Boxer Brief 5.8 1
ProActive Soft Boxer Brief 5.8 2
ProActive Soft Boxer Brief 5.8 3
ProActive Soft Boxer Brief 5.8 4
4.995 Verified Reviews
Climate Trunk, Skew Fly, CoolTech, 3-Pack, Black

Made for the days cotton gives up on.

Wear one hard, then reach for the next. Which is why they come in threes.

First Order Guarantee
First Order Guarantee:
Not satisfied? We’ll make it right. No return required.
Free Shipping & Returns:
On all orders over $80.
Fast Delivery:
Arrives within 10–14 business days.

The difference is in the pouch.

Flat-front trunks press everything against your thighs. That skin-on-skin contact traps heat and sweat. Our two-part anatomical pouch creates separation, so air can move and you stay drier and more comfortable through the day.

Regular trunks
Regular trunks
Pressed together
Skin stays against skin. Heat builds, sweat collects, and things get damper as the day goes on.
Climate Trunk anatomical pouch
Climate Trunk
Room to breathe
The two-part pouch keeps you off your thighs, so heat escapes, sweat dries, and you stay comfortable.
4.995 Verified Reviews

What men say after a long day in them.

Real men. Real results.

Justin T.
09.01.2026

Really comfortable trunks for long days. I wear them under my work pants and for evening runs, and they handle both fine. Cooling fabric actually makes a difference.

Karen A.
08.01.2026

Bought these for my husband to try something cooler for his workouts. He came back from the gym saying it was the first time he didn't have to adjust anything mid-set. The black looks sleek and doesn't show sweat marks. Shipping was quick too, which I appreciated.

Marcus D.
11.02.2026

Ten-hour shifts on a warehouse floor, half of it in a forklift seat. By lunch the cotton ones used to be soaked through. These stay dry and the legs never crawl up under the coveralls.

Priya S.
05.02.2026

Desk, meetings, then a train home in a wool suit. Sitting all day was always the worst part; with these the seat heat just does not build the same way. Bought my partner three more pairs.

Kyle G.
17.02.2026

Great for biking and hiking

Brandon T.
04.02.2026

Lightweight, supportive, worth the money

First Order Guarantee
Climate Trunk worn, mid-movement

Heat. Movement. A day that doesn't stop.

CoolTech is a lightweight, quick-dry knit. It moves sweat off your skin instead of holding it there. That is the whole difference between one good day and one long one.

Hot climates
Where cotton goes damp by mid-morning and stays that way.
Active movement
Squats, ladders, scaffolds. The leg stays where you put it.
Long work days
Ten hours on your feet, and it still feels like morning.
Time to reset
They worked as hard as you did. A quick wash, a faster dry, and back in shape.
First Order Guarantee

Cotton gives up. CoolTech doesn't.

Engineered more like space gear than ordinary underwear. Its technical micro-knit moves sweat away from your skin and dries fast, while cotton soaks it up and keeps it close.

Two-part anatomical pouch
SEPARATION
Held, not pressed
A two-part pouch with an angled fly, not a flat front.
CoolTech fabric macro
FABRIC
CoolTech, not cotton
Microscopic channels pull moisture away, spread it out, and help it dry fast.
Perforated mesh side panels
MESH
Ventilation, built in
Perforated mesh runs through the side panels, gusset, and inner pouch, giving trapped heat and moisture a way out.
Bound leg opening
LEG
Bound, not rolling
A bound opening instead of a hem, to resist riding up.

CoolTech moves sweat off you.

Engineered more like space gear than ordinary underwear. Its technical micro-knit moves sweat away from your skin and dries fast, while cotton soaks it up and keeps it close.

Wicks
Pulls sweat off the skin
Dries fast
Does not stay damp
Lightweight
You stop noticing it
Elastic
Moves with you

Mesh curtains, where the heat collects.

Panels down both sides of the pouch. They hold the intimate area away from your inner thighs, so heat and damp have somewhere to go.

Mesh panels beside the pouch, front view
Mesh side panel, back view
Open mesh
side panels
Separation
at the groin
Heat gets
a way out
Less skin
on skin

Stretches. Grips. Stays put.

The elastic edge moves with your leg and keeps the fabric from creeping up, without digging in.

ProActive Soft Boxer Brief 5.8
4.9·95 reviews
Climate Trunk, Skew Fly, CoolTech, 3-Pack, Black
$91.75
Colour

Choose your fit

Size
Quantity
1
ProActive Soft Boxer Brief 5.8
Climate Trunk, Skew Fly, CoolTech, 3-Pack, Black
$91.75
1
Size Guide
How to measure
Size Chart — Body Measurements
Between sizes? Size up for more room, down for a tighter hold.