Tyler B.
★★★★★
No more adjusting
“Heavy leg day and did not have to adjust once. Fabric feels like nothing.”
4-Way
Stretch
Stretch
Moisture-
Wicking
Wicking
3 Pieces
per Pack
per Pack
SolVault™ StealthFlex
Seamless Athletic 3-Pack
Brushed nylon-spandex seamless underwear with bonded no-show edges. Moisture-wicking, 4-way stretch, and invisible under gym shorts or dress pants.
- Seamless, bonded no-show edges
- Brushed nylon + spandex (74/26)
- Moisture-wicking, 4-way stretch
- 3 pieces in every pack
Choose Your Bundle
9 Pieces — Best Value
Buy 3 PacksA full week and then some · $10.54 per piece
$137.77$348.00
Choose a color set and size for each pack:
Pack 1
Pack 2
Pack 3
Save $90 — Most Customers Pick
Buy 2 Packs6 pieces · $11.65 per piece
$101.48$232.00
Choose a color set and size for each pack:
Pack 1
Pack 2
Buy 1 Pack3 pieces
$58.00$116.00
A color set and size:
Free Training Recovery GuideStretching, sleep and recovery basics (PDF)INCLUDED FREE
In stock — Ships within 24h
🎁 Free gift with your order today
Reusable Hand Warmers (2-Pack)Click, and they heat up. Boil to reset.
Full Specs
- 3 pieces per pack
- Fabric: 74% nylon, 26% spandex, brushed finish
- Seamless knit with bonded no-show edges
- Contoured front pouch
- Moisture-wicking, 4-way stretch
- Care: machine wash cold, hang dry
- Sizes: XS to 5XL
Why It Disappears
Seamless knit and bonded edges mean no elastic ridges or seams to show through tight shorts or slim pants. The brushed nylon-spandex blend wicks sweat and stretches in every direction, so nothing rides up when you move.
Shipping, Returns & Exchanges
Free US shipping. Orders ship within 24h on business days. Size exchanges on unopened packs within 30 days. 30-day satisfaction guarantee.
Made for Everyday Movement.
Gym bags, drawers, suitcases and early runs.
The Real Problem
Cotton Holds Sweat. Seams Show Through.
Cotton gets damp and heavy halfway through a workout. Regular waistbands and seams leave lines under slim pants and compression shorts. You end up adjusting all day.
74/26Nylon + spandex blend
XS–5XLNine sizes
✕Damp cotton. Visible lines. Constant adjusting.✓SolVault™ seamless, wicking and invisible.
What's Inside
Built to Disappear. Every Detail.
Every detail earned its place. Nothing decorative.
4-Way Stretch
- Moves in every direction
- Snaps back to shape
Training Ready
- Squats, runs, rides
- Nothing rides up
Three Colors
- A full set in every pack
- Two color sets to pick
Easy Care
- Machine wash cold
- Hang dry, ready fast
Office Invisible
- No lines under slim pants
- Bonded edges lie flat
Reviews
Why Guys Switch and Don’t Go Back
Rated 4.4 out of 5 stars.
Marcus J.
★★★★★
Stays dry
“Ran 8 miles, no chafing, no soggy cotton.”
Kevin R.
★★★★★
Invisible under suits
“No lines under my slim dress pants. Wear them every workday.”
A Full Day
One Pair. Gym to Dinner.
Where regular underwear lets you down, and where these keep up.
-
6 AMThe run. Cotton soaks through by mile two.SolVaultMoisture-wicking blend stays light.
-
9 AMThe office. Waistband lines under slim pants.SolVaultBonded edges lie flat.
-
1 PMThe commute. Bunching every time you sit.SolVault4-way stretch moves with you.
-
6 PMThe gym. Riding up on every squat.SolVaultSeamless knit stays put.
-
9 PMDinner. Still feel fresh? Not in cotton.SolVaultBreathable all day.
Side by Side
SolVault™ vs The Alternatives.
Most guys wear cotton boxer briefs, basic trunks or cheap multipacks. Here is how they compare.
SolVault
✓Seamless
✕+Wicks Sweat
✕+4Way Stretch
✕+No Lines
✕+Stays Put
✕+$13/piece
Cotton Boxer Briefs
✕Seams
✕Holds Sweat
✕Stretches Out
✕Leg Lines
✕Rides Up
✕+Cheap
Basic Trunks
✕Seams
✕Some Wicking
✕+Stretch
✕Waistband Ridge
✕+Stays Put
✕+Cheap
Premium Brands
✓Seamless
✕+Wicks Sweat
✕+Stretch
✕+No Lines
✕+Stays Put
✕$30+/piece
By the Numbers
What's In Every Pack.
No fluff. Just what you get when you open the box.
3Seamless pieces in every pack
74/26Brushed nylon + spandex
9Sizes from XS to 5XL
0Visible lines under slim pants
Rated 4.4/5 by customers
Sizing
Pick Your Size in 3 Steps.
-
1
Measure your waist
Match it to your usual underwear size.
-
2
Between sizes?
Size down for a snug athletic fit, up for relaxed.
-
3
Train in them
Wrong fit? Free exchange within 30 days on unopened packs.
FAQs
Everything You Need to Know.
Plain answers to the questions we get the most.
How does it fit?
Snug and athletic. Order your usual underwear size.
What is the fabric?
74% nylon and 26% spandex with a brushed, soft finish.
Will it show under tight clothes?
The seamless knit and bonded edges are designed to lie flat under compression shorts, slim chinos and dress pants.
Is it good for the gym?
Yes. It wicks sweat and stretches in every direction.
Which colors come in a pack?
Each pack has 3 pieces in the color set you choose.
How do I wash it?
Machine wash cold, hang dry. Skip fabric softener to keep the wicking working.
Can I exchange for another size?
Yes, on unopened packs within 30 days, for hygiene reasons.
What's your guarantee?
30 days. If they are not for you, contact us for a refund.
Risk-Free Purchase
30 Days. Zero Risk.
Train in them, work in them, travel in them. If they are not the most comfortable pair you own, contact us within 30 days for a full refund.
30-Day TrialFull refund. No questions asked.
Free US ShippingShips within 24h on business days.
Nine SizesXS to 5XL.
Reviews
Gyms, Offices & Airports.
Lifters, runners, commuters and travelers.
Josh K.
★★★★★
No chafing
“Long WOD, zero chafing.”
Andre M.
★★★★★
Great on the bike
“Comfortable under bib shorts.”
Ryan P.
★★★★★
12-hour shifts
“Forgot I was wearing them.”
Chris L.
★★★★★
Packs small
“Rolled three into my carry-on.”
Evan S.
★★★★★
Stays put
“Squats and deadlifts, nothing moves.”
Brandon W.
★★★★★
No lines
“Clean look under slim pants.”
Luis T.
★★★★★
Light fabric
“Barely there on long runs.”
Nate D.
★★★★★
Tough
“Holding up after lots of washes.”
Omar F.
★★★★★
Good colors
“The plum set is great.”
Derek H.
★★★★★
Bought 3 packs
“Replaced my whole drawer.”
Sam V.
★★★★★
Dries fast
“Rinsed on a trip, dry by morning.”
Jordan A.
★★★★★
4XL fits
“Finally a seamless pair in my size.”