Leakproof Classic One Piece Swimsuit
• Timeless style in a fit that we’ve spent years perfecting
• Adjustable straps make it adaptable for different torso lengths
• Premium UPF 50+ fabric
• Discreet, built-in protection against leaks: Absorbs about 1 regular tampon worth of blood
Fit tip: Plus cup sizes come with thicker straps for added support.
Leakproof fit tip: A snug fit against your body helps keep everything where it should be. Check the size guide to find your best fit. If you’re in between, size down to ensure the liner is sitting closer to your body.
• Absorbs about the same as 1 regular tampon worth of blood
• Full butt coverage
• Adjustable straps
• Built-in shelf bra
• Removable cups
• Thicker straps for plus cups for added support
🇨🇦 Free standard shipping over $100.
Free expedited shipping over $150.
(after discounts, before shipping + taxes) All items ship from within Canada.
Swim items are eligible for a return or exchange within 30 days of delivery and with tags and original sanitary strip (swim bottoms and one pieces) attached. For sale items with a 20% or more discount you may exchange for another item or store credit.
Your swimwear questions, answered.
Yes, our entire Swim Collection is available for exchange or return. If you’re not happy with your fit, the suits can be returned within 30 days with the sanitary strip intact and tags attached.
Most of our swimsuit styles come in options for A-G cups. Select styles accommodate from an A-DD. Please refer to the side guide on the product page for details.
Yes, some of our suits do have cups that can be removed. Please refer to the “How It Fits” section on the product page for details.
Fit to your cup size for the best support. If there is a dramatic difference between your underbust and hip measurement, we suggest trying the suit on with the sanitary strip intact and tags attached. That way it can be returned or exchanged for a better fit if needed.
- Angela2 days agoRated 5 out of 5 stars5 Stars
Fits well, nice fabric
Was this helpful? - Chelsea B.Verified Buyer1 week agoRated 5 out of 5 starsVery flattering pretty suit!!
I have never bought a Knix bathing suit before and now it might be the only ones I buy! It was so comfy and flattering! Bonus that it’s leak proof! The color is very trendy and I got many compliments!
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentFitRated 0.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeSupportRated 3.0 on a scale of 1 to 5Low HighEffectivenessRated 3.0 on a scale of 1 to 5Poor ExcellentEase of UseRated 5.0 on a scale of 1 to 5Poor ExcellentWas this helpful? - Suzanne A.Verified Buyer1 week agoRated 5 out of 5 starsFabulous tank suit
Excellent fit. Need more colors/patterns in both leak proof and regular.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentFitRated 0.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeSupportRated 5.0 on a scale of 1 to 5Low HighEffectivenessRated 5.0 on a scale of 1 to 5Poor ExcellentEase of UseRated 5.0 on a scale of 1 to 5Poor ExcellentWas this helpful?