WunderUndies
Briefs Trial Pack - Flat Seams
Briefs Trial Pack - Flat Seams
Find My Size
$12 with coupon
A Find My Size Trial Pack includes 2 pairs of WunderUndies in consecutive sizes, in the same design and style. Please consult the size chart (below) to decide which 2 sizes you'd like to try. Use coupon 2FOR12 at checkout to get the discount. If you get one that's too small, give it to a friend!
*New Customers Only
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PRODUCT DESCRIPTION
PRODUCT DESCRIPTION
This listing is for the Find My Size WunderUndies Breifs Trial Pack with flat seams.
We have found that while kids love their WunderUndies, they are very particular about their sizing. Some like them looser and some like them tighter. So the Find My Size Trial Pack was invented! With this trial pack you will receive 2 pairs of WunderUndies briefs in 2 different sizes. This way you can find the size that suits your child the best.
WunderUndies briefs are the ultimate solution for sensory-sensitive kiddos—or for any parent whose child hates to wear underwear. Designed with care, these briefs are crafted from incredibly soft, eco-friendly bamboo fabric that feels like a second skin. Say goodbye to irritation and discomfort—WunderUndies are elastic-free, featuring a fabric waistband that stays comfortably snug without pinching or slipping.
What makes these briefs truly special is their flat-seam construction, meticulously crafted with a flat lock machine. Waistbands and leg bands have their seams on the outside and are sewn flat, ensuring a smooth, irritation-free experience. Paired with a tagless design, these briefs are a game-changer for kids who struggle with traditional underwear.
Once your child tries WunderUndies, they’ll finally have underwear they love—and so will you.
Available in sizes 2T–12.
SOFT VS FLAT SEAM BOXER SIZE
SOFT VS FLAT SEAM BOXER SIZE
With WunderUndies first round of boxers, it quickly became clear that they ran small. So with the next round we made some needed changes. They are:
1. We shifted everything one size. Our old size 12s are now size 10s and so on and so forth.
2. We enlarged the waistbands ever so slightly.
If you have bought from us before and are worried about what size might fit your child now, you are welcome to get another trial pack. But if you are new to WunderUndies we believe that the size chart above now more accurately reflects the best fit for our Flat Seam undies. If you are buying Soft Seam Undies, consider sizing up.
As always, we highly recommend getting a trial pack first.
CARE INSTRUCTIONS
CARE INSTRUCTIONS
Some people see bamboo fabric and worry that it will be hard to care for. It's not! Many customers have praised the durability of WunderUndies. Here's what you need to know:
Machine wash cold with mild detergent. No fabric softener. Dry on low. If you feel the need to iron your undies, do that on low too. These are the practices for the longest lasting undies.
OUR BAMBOO COTTON BLEND
OUR BAMBOO COTTON BLEND
Our fabric blend of 67% bamboo, 28% cotton, and 5% spandex is crafted to provide unmatched comfort, durability, and versatility. Bamboo offers exceptional softness, breathability, and moisture-wicking properties, making it perfect for sensitive skin and active kids. Cotton adds strength and structure, ensuring long-lasting wear, while the addition of spandex delivers just the right amount of stretch for a snug, flexible fit. This thoughtful combination creates underwear that feels gentle, moves effortlessly, and stands up to everyday play, all while supporting sensory-friendly comfort.
Size Chart
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The waistband on WunderUndies is very snug. If your child doesn't like snug clothing, consider sizing up.
Let customers speak for us
from 12 reviewsWe got a trial pair for our kiddo and had to come back and get a bunch more! Kiddo is girl-identifying, born with a vulva, and prefers to wear "boy" briefs due to sensory needs but sometimes had issues with underwear gaps when sitting down wearing a dress. She LOVES the trial pair and says they are more comfortable than any other undies she's ever worn! She likes the feel of the fabric ("girl" undies fabric feels too thin and "boy" undies just aren't as soft) and prefers the waist and leg bands to the elastic on "regular" undies. She also likes the patterns but would probably wear them even if the prints were boring because they are so well designed.
As a mom of a 6yo boy who is usually only in shorts bc underwear are hard to find that meet his requirements. He loved them, took him a bit to actually put them on but when he did he was surprised at the softness and how they fit. He is also very active and they stayed in place. Not to mention he wore them to his MRI and the Dr. and nurses were just as impressed with them.
Only downside for us is the price as a special needs mom we can not afford to have many of them, although we completely understand your time and the cost of materials ect. We thank you for making wunderundies, sensory-friendly for families like our!
My daughter has a sensory issue with underwear and these panties (two different styles) have been amazing! No more digging in her underwear! THANK YOU!
My daughter absolutely loves her new Wunder Undies! No elastic that digs in and she loves to pick out the design each day. I would love to see some neutral solids like nude or tan to wear under white and light colored clothing.
My girls (7 and 9) both adore these briefs and complain to me if we don't have any wunderundies in the clean laundry. They are very fussy about underwear and these are the clear winners. They are also sturdy and are holding up great to frequent washing.
My daughter was hooked after we got our 1st pair. She loved how comfortable and fun they were. And I loved that they were good coverage appropriate for her age. Not those teeny bikinis that are in stores for size 6 kids!. Win/win!
My son and daughter both LOVE these undies. The fabric is super soft, and the kids were obsessed with the adorable prints!! 100% recommend especially if your kiddos have sensory sensitivities!
Had to grab more of these WunderUndies after my boys fell in love with their first pairs and were always asking for their ice cream and donut undies! My oldest struggles with tags (we’re always cutting them out), so tagless undies are a must for us. They're also super soft, which is another win for sensory sensitivities. Even my little one, who's in the 'No get dressed' phase these days, loves picking out his undies each day. Those fun prints make all the difference! We love our WunderUndies and will definitely be back for more. 💜