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PREVAIL · TRUNK

4.9

Rated 4.9 out of 5 stars

4,618 Reviews

$38.00

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Select Your Color:

Ivory

Why You'll Love This

No seams, no lines, no distractions. A smooth waistband and four way stretch go anywhere.

VANGUARD

Say goodbye to waistband digs, underwear lines, and the friction distractions of your final mile ride.

SILVADUR™

SILVADUR™ antimicrobial delivers "intelligent" microbial control of bacteria that cause odor.

PRIME WICKING

AEROSKYN™'s 3D fiber network channels sweat and accelerates evaporation at core temperature.

MAXI-AIRFLOW

Airburst™ technology keeps you dry and cool, delivering the ultimate gear that eliminates discomfort.

Product Details

Designed for Peak Performance

Product Features

•Minimalist design
•Seamless leg openings
•Odor resistant
•Antibacterial
•Smooth 4-way stretch
•Moisture wicking finish
•Quick-drying
•Breathable design

Size & Fit Suggestions

•True to Size
•Snug, not tight
•Freedom of movement

Activities

•Basketball
•Casual Wear
•Running
•Cycling
•Strength Training
•Hiking

Material & Care

Materials

85% Polyamide (Nylon), 15% Lycra® Elastane
Certified Safe: OEKO-TEX® STANDARD 100 #HKKH 029897 by TESTEX

Care

Machine Wash Cold
Hang Dry

Best Pair Guarantee

If you're not satisfied with your first purchase, we'll make it right by issuing a refund or exchanging the item even if it has been worn. So If you've ordered multiple pairs of Aeroskyn™ on your first order, we suggest wearing one pair before opening the other pairs you've ordered.

4.9

Rated 4.9 out of 5 stars

Based on 4,618 reviews

Total 5 star reviews: 4.3k Total 4 star reviews: 211 Total 3 star reviews: 43 Total 2 star reviews: 13 Total 1 star reviews: 28

4,618 reviews

Sort

RS
Raj S.
Verified Buyer
Reviewing
PREVAIL · TRUNK XL
I recommend this product
Rated 4 out of 5 stars
11/5/25
Pickleball Morning Rally
Played several morning pickleball matches. Supportive and dry all session. The hips felt slightly snug after repeated lunges, but still very comfortable.
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JL
James L.
Verified Buyer
Reviewing
PREVAIL · TRUNK XS
I recommend this product
Rated 4 out of 5 stars
11/4/25
Handles tropical heat
Vacationed in Hawaii with these - the lightweight material handled humidity like a champ. Didn't get that damp, clingy feeling even after hours outdoors.
Was this helpful?
LG
Leon G.
Verified Buyer
Reviewing
PREVAIL · TRUNK S
I recommend this product
Rated 4 out of 5 stars
11/4/25
Weekend Getaway Pick
Quick-drying and comfortable for short trips and varied activities.
Was this helpful?
U
UnderXLabs
11/6/25
Hi Leon G., we're happy they're quick-drying and comfortable for short trips and varied activities! That versatile performance is perfect for your active lifestyle.
EB
Erik B.
Verified Buyer
Reviewing
PREVAIL · TRUNK S
I recommend this product
Rated 4 out of 5 stars
11/2/25
Nice Everyday Wear
Feels fine for long walks or just relaxing at home. Not amazing, but worth keeping in the drawer.
Was this helpful?
U
UnderXLabs
11/4/25
Hi Erik B., we're glad they work well for walks and relaxing at home! We appreciate your honest feedback and are happy they earned a place in your drawer.
JV
Jonathan V.
Verified Buyer
Reviewing
PREVAIL · TRUNK M
I recommend this product
Rated 4 out of 5 stars
10/30/25
Daily Go-To
My grab-and-go pair for everyday wear.
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FK
Felix K.
Verified Buyer
Reviewing
PREVAIL · TRUNK XL
I recommend this product
Rated 4 out of 5 stars
10/13/25
Easy Choice
Simple design, good fit, does the job.
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AX
Amir X.
Verified Buyer
Reviewing
PREVAIL · TRUNK M
I recommend this product
Rated 4 out of 5 stars
10/2/25
Cool and supportive
Great for pickup basketball and weekend hikes. Light, breathable, and they keep everything in place. I’d happily buy a few more if there were a multi-pack deal.
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EM
Ethan M.
Verified Buyer
Reviewing
PREVAIL · TRUNK XS
I recommend this product
Rated 4 out of 5 stars
10/2/25
Hiking Comfort
No chafing on a long trail. Fabric’s a bit thicker than I expected.
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EL
Enzo L.
Verified Buyer
Reviewing
PREVAIL · TRUNK M
I recommend this product
Rated 4 out of 5 stars
9/29/25
Outdoor Climbing Trip
Spent half a day on outdoor climbing routes. These stayed cool even under the harness. After many climbs the leg openings felt a bit tight, but nothing serious.
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TJ
Thomas J.
Verified Buyer
Reviewing
PREVAIL · TRUNK M
I recommend this product
Rated 4 out of 5 stars
9/20/25
Office sharp
Invisible under tailored pants, breathable for long meetings.
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U
UnderXLabs
9/22/25
Hi Thomas J., we're happy they're invisible under tailored pants and breathable for long meetings! That professional comfort is ideal.