Join Our Rewards Program
Earn rewards and exclusive member-only benefits for free.
Light Leakproof UltraThin No-Show Thong - Last Call
Last Call
Light Leakproof UltraThin No-Show Thong - Last Call
$18.90
USD
$27.00
30-40% off
Absorbs about 2 regular tampons
Invisible under clothes
More absorbency without bulk
Machine washable
Size and Fit Guide
How to Measure
In order to select the correct sizing, we recommend you take the following measurements using a soft tape measure. If necessary, ask someone else to help.
Waist
Measure around the narrowest part of your torso, usually just above your belly button. Keep the tape snug and level, but not tight. The number where it meets is your waist measurement.
Hip
Stand with your feet together and measure around the fullest part of your hips and buttocks. Keep the tape level and snug, but not tight. The number where it meets is your hip measurement.
Rewards Members Earn
18 Points
You May Also Like
Product Description
Comfort-First Fit
Thong silhouette sits lower on the hip with minimal bum coverage.
Worry-Free Protection
Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.
Moderate Absorbency
It absorbs about 2 regular tampons worth of liquid—great for regular flow days, light bladder leaks, and sweat.
No-Show Style
Buttery-soft and smooth fabric gives a seamless look and feel. Disappears under clothes, even leggings.
Easy to Wash
Machine washable, just like your regular underwear.
Zoom
How to Choose?
Essential
- • Days you don’t need leak protection. Everyday freshness and moisture wicking.
-
0 tsp
Heavy
- • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
-
about 8-14 tsp
-
about 1.5-3 regular pads
-
about 4-7 super tampons
-
about 1.5-3 menstrual cups
Light
- • Daily freshness. For sweat, discharge, period spotting, or backup protection.
-
about 1-3 tsp
-
about 1-3 pantyliners
-
about 1-3 regular tampons
-
about 0.5 menstrual cups
Moderate
- • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
-
about 4-8 tsp
-
about 1-1.5 regular pads
-
about 2-4 super tampons
-
about 0.5-3 menstrual cups
Ultra
- • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
-
about 15-20 tsp
-
about 1.5-2.5 super pads
-
about 7-11 super tampons
-
about 2-3 menstrual cups
Recently Viewed
Explore Best-Sellers
Shop All
Restocked
Super Leakproof® Mini Dream Boxer
$48.00
USD
Buy More, Save More
Color: Blue Stripe
+2
Our #1 Bra
Revolution V-Neck Bra
$65.00
USD
Color: Black
+6
Super Leakproof® Dream Short™
$42.00
USD
Buy More, Save More
Color: Twilight Navy
+3
WingWoman Contour Bra
$68.00
USD
Color: Periwinkle Limited Edition
+1
Restocked
Super Leakproof® Dream Boxer™
$48.00
USD
Buy More, Save More
Color: Blue Stripe Polka Dot Limited Edition
+2
Adds one cup size
Uplift Push Up Bra
$68.00
USD
Color: Warm Sand
+2
High Support
Catalyst Sports Bra
$78.00
USD
Color: White
+1
Total 5 star reviews: 174 Total 4 star reviews: 25 Total 3 star reviews: 21 Total 2 star reviews: 16 Total 1 star reviews: 40
What our customers are saying
Generated by AI from 100 most recent customer reviews
Last updated 2 months ago
Customers say these leakproof thongs offer good protection and comfort for light days, gym wear, and everyday use. Many reviews mention significant sizing inconsistencies, with most recommending sizing up at least one size from usual underwear sizes. Common feedback includes concerns about stiff material and tight fit, particularly around the waistband and edges. While some find the fabric less stretchy than expected, others praise the seamless design and confidence it provides. Frequent comments address the protective gusset placement, with mixed experiences on coverage effectiveness. Reviews are divided on durability and comfort after washing.
74%would recommend these products
Search
Keywords
Rating
Height
How do you use your Leakproof?
Usual Pant Size
276 reviews
- Rated 5 out of 5 stars36 minutes agoComfortable
So comfortable and perfect for when I’m on my period !! Little snug when you first wear but they stretch with wear and wash. Don’t forget to hang to dry
KKnix4 minutes agoHey Priscilla!
Thanks so much for the amazing review! We're thrilled you're loving the comfort of our Light Leakproof UltraThin No-Show Thong. Thanks for the helpful care tip!
Team Knix
Priscilla S. T.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 starsYesterdayWorks great!
Excellent
KKnixYesterdayHey Katharine!
We're so happy to hear our Light Leakproof UltraThin No-Show Thong is working great for you! Thanks for the amazing review!
Team Knix
Katharine B.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars1 week agoThin, no show, great protection
Love how thin and protective this thong is! I like that I can feel comfortable wearing light coloured pants without worrying about leaks.
KKnix1 week agoHey Sandy!
We're so happy to hear you're loving the ultra-thin protection and confidence it gives you in light colored pants! That's exactly what we were going for!
Team Knix
Sandy H.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 1 out of 5 stars1 week agoNot comfortable
Chafes my thighs.
Susan M.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 1 out of 5 stars1 week agoPoor Quality
I’ve ordered the same kind for years but my recent purchase is terrible quality. The internal liner is rippled and poorly sewn in which causes them to bunch up in the front which shows thru my leggings. Very inconsistent quality the last several years & disappointing.
Laurie H.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars2 weeks agoNew and improved
I have a couple of older lightproof thongs that are ok but the new and improved ones I like more. I feel confident wearing them.
KKnix2 weeks agoHey Leah!
This is amazing! We're so thrilled you're loving the improvements and feeling confident in your new Light Leakproof UltraThin No-Show Thong!
Team Knix
Leah G.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars4 weeks ago5 Stars
As expected- great product. Im a repeat buyer and will continue to be.
CassieReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars1 month agoThese are the best!!
I love these!!
KKnix1 month agoHey Shannon!
This made our day! We're so thrilled you're loving our Light Leakproof UltraThin No-Show Thong. There's nothing better than hearing our customers feel amazing in their Knix!
Team Knix
Shannon P.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 5 out of 5 stars1 month agoSoooo very comfortable!!
I love these underwear and how comfortable they are! I also love the leakproof part and not having to worry!! I won’t buy any other underwear these are definitely the best….I would know I have tried so many other kinds!!!
KKnix1 month agoHey Erica!
We're so happy to hear you found your perfect match! Nothing beats that worry-free comfort. Thanks for giving us a try after all those others!
Team Knix
Erica A.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 4 out of 5 stars1 month ago4 Stars
Runs small
HeatherReviewingPOS - Light Leakproof UltraThin No-Show Thong Shimmer 3-Pack - Rated 5 out of 5 stars1 month agoGreat underwear!
These fit so well. Very comfortable. Don’t move around so no need to keep re-adjusting all day. Highly recommend. I have purchased 4 pairs already. So nice!
Christine B.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong - Rated 2 out of 5 stars1 month agoSounds and feels like rubber
I have ordered them for a while and Lyly they seem like they are more and more being made out of rubber
Even my husband said what the heck are you wearing it sounds like a rubber band
Don’t know hat your changing but may have rethink future purchases.
Same with the bras
noreen P.Verified BuyerReviewingLight Leakproof UltraThin No-Show Thong
