Our Flex collection of polo and button down shirts were made for the man on the move. The fabric is made from a cotton blend jersey knit that feels incredibly soft against the skin. It also stretches in every direction making these shirts absurdly comfortable and effortlessly practical.
Some premium details on this button down include button-less cuffs and innovative under-collar buttons to keep the collar neat. They are tailored to fit shorter men perfectly, thanks to a shorter overall length. Like all of our shirts, these have a modern fit that is gently hugs the arms but gives plenty of room in the chest and stomach.
Modern fit features slim sleeves and room to breathe in the body
Flex knit fabric is comfortable, stretchy, and soft
46% Cotton 46% Polyester 8% Spandex
Small spread collar with hidden buttons to keep collar neat
Short length for untucked styling
Long sleeves
Button-less cuffs for easy on/off
Great for the office, WFH, and casual wear
Machine wash in cold water, air dry only
Imported
Runs True to Size - Order your typical shirt size from Under 510. Our polo shirts are cut for a contemporary look; slim in the sleeves with room in the body for drape and breathability. Made in a shorter length to fit short men.
Free U.S. Shipping for Orders $150+
Enjoy complimentary shipping on orders of $150 or more to all 50 US states.
Free U.S. Shipping for Orders $150+
Enjoy complimentary shipping on orders of $150 or more to all 50 US states.
Our goal is to deliver a near perfect 'WOW' fit for men Under 5'10. Enjoy free shipping on U.S. orders over $150, along with easy, free U.S. returns and exchanges. Experiment with various sizes and styles on your first purchase to discover what works best for you. With 24/7 round-the-clock support from our devoted customer support team, we're committed to ensuring your absolute satisfaction with every purchase.
Perfect Fitting Clothes
Our goal is to deliver a near perfect 'WOW' fit for men Under 5'10. Enjoy free shipping on U.S. orders over $150, along with easy, free U.S. returns and exchanges. Experiment with various sizes and styles on your first purchase to discover what works best for you. With 24/7 round-the-clock support from our devoted customer support team, we're committed to ensuring your absolute satisfaction with every purchase.
I absolutely love these shirts! I got the medium I’m 5’ 2” and weigh 155 lbs and as you can see if it fits me so nicely! I’m definitely gonna purchase more.
How it fitsRated 0.0 on a scale of minus 2 to 2
Runs Small True to Size Runs Large
JN
Jayce N.
Verified Buyer
What is your height? 5'2"
How old are you? 26-30
What is your weight? 120-130lbs
What is your body type? Athletic
4 months ago
What is your height? 5'2"
How old are you? 26-30
What is your weight? 120-130lbs
What is your body type? Athletic
Reviewing
Flex Short Sleeve Button Down Shirt Navy
Rated 5 out of 5 stars
Great for a small transgender guy
Love the fit. I'm 5' 2" and weigh 120lbs and I'm in good shape with natural muscle mass and this shirt fits perfectly. It affirms my gender identity and the quality of the shirt is amazing. Stretchy, nice cut, and breathable. I'm diggin" it and I will definitely will be picking up some more. Would love to see an army green. Thank again under 510! I've been struggling to find a true masculine pro outerwear. And you made my dream come true. Peace!
How it fitsRated 0.0 on a scale of minus 2 to 2
Runs Small True to Size Runs Large
NL
Nox L.
Verified Buyer
What is your height? 5'2"
How old are you? 31-35
What is your weight? 120-130lbs
What is your body type? Normal
2 days ago
What is your height? 5'2"
How old are you? 31-35
What is your weight? 120-130lbs
What is your body type? Normal
Reviewing
Flex Polo Gray Mist
Rated 4 out of 5 stars
True to size
I never find clothes that fit. Finally a shirt that fits! Soft
How it fitsRated 0.0 on a scale of minus 2 to 2
Runs Small True to Size Runs Large
BR
Boanrges R.
Verified Buyer
What is your height? 5'3"
How old are you? 56-60
What is your weight? 170-180lbs
What is your body type? Normal
6 days ago
What is your height? 5'3"
How old are you? 56-60
What is your weight? 170-180lbs
What is your body type? Normal
Reviewing
Flex Polo Steel Blue
Rated 4 out of 5 stars
Excelente
Excelente material entrega rapida y buen color
How it fitsRated 0.0 on a scale of minus 2 to 2
Runs Small True to Size Runs Large
CB
Christopher B.
Verified Buyer
What is your height? 5'9"
How old are you? 46-50
What is your weight? 170-180lbs
What is your body type? Normal
6 days ago
What is your height? 5'9"
How old are you? 46-50
What is your weight? 170-180lbs
What is your body type? Normal
Reviewing
Flex Short Sleeve Button Down Shirt Navy
Rated 5 out of 5 stars
Great Looking Shirt
Fits perfectly as described.. I ended up buying all the colors..