Expertise
Why the 355
Wear Every Dress.
Walk Every Step.
Your secret to wearing dresses and skirts with total confidence — no more worrying about thigh rub or visible lines. Just smooth, comfortable protection that moves with you.
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Dual Function Design
Anti-chafing protection plus light smoothing at the waist — two problems solved in one seamless short.
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Thin & Breathable
The fabric is thin enough to disappear under any outfit while still providing all-day protection against chafing.
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3 Inseam Options
Choose 5", 6", or 7" to match your preference and the length of your dress or skirt.
What Makes It Different
Engineered for All-Day Comfort
Three design decisions that set the 355 apart from every other thigh protector on the market.
No More Thigh Rub
The 5" inseam gives you full coverage from waist to mid-thigh so you can walk, move, and live your life without that uncomfortable friction. Seriously, it’s life-changing. Wear any dress, any skirt, any day — without a second thought.
Anti-Chafing Technology
Invisible Under Everything
From waist to hem, no one will know you’re wearing them — but you’ll feel the difference with every step. The seamless construction means zero visible lines under any outfit. The 2-ply comfort waistband sits at your natural waist without rolling, digging, or requiring constant adjustment.
Seamless Construction
Light Smoothing at the Waist
Not tight compression — just gentle smoothing at the waist that makes everything look a little more polished. The at-waist smoothing design is so lightweight and soft, you’ll actually forget you have them on. Moisture-wicking fabric keeps you cool and dry all day long.
At-Waist Smoothing5", 6" , 7" Inseam
Our Story
Built by Women,
for Women
Underoutfit was founded on one simple idea: women deserve comfortable, functional intimates that actually work. Over 30 years of expertise and 2,000,000+ happy customers later, we’re still obsessed with solving the problems other brands ignore.
2M+ Customers
Over two million women have discovered the Underoutfit difference. Join them.
30+ Years
Three decades of expertise in women’s intimate apparel. We know what works.
180-Day Promise
Try it at home for 180 days. Free returns, free exchanges, no questions asked.
“We asked women what they hated about thigh chafing. Then we fixed it. The 355 is the result of listening to thousands of women who just wanted to wear a dress without thinking twice.”
What Our Customers Say
“I’ve tried every anti-chafing product out there. These are the only ones that actually stay in place all day. I wore them to a wedding in July and forgot I had them on. That’s never happened before.”
“I’ve been wearing these under everything — dresses, skirts, even fitted pants. Zero visible lines. The waistband doesn’t roll and the fabric is so thin you can’t feel it. Ordered three more pairs.”
“Every other pair I’ve tried rolls down or bunches up. These stay exactly where you put them. The 2-ply waistband is genius. I’m a convert — I’ve already recommended them to five friends.”
Our Promise
Try It at Home.
Risk Free.
Try it on, wash it, wear it again. Repeat. Don’t love it? Return it. Free exchanges and free returns for 180 days — Underoutfit pays for shipping both ways.
Order two sizes or a few colors to try at home. If it doesn’t fit or you don’t love it, just send it back. No questions asked.
Free returns • Free exchanges • We pay shipping