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Home / Best of the Best Sale / Classic One Piece Swimsuit
Sale

Classic One Piece Swimsuit

$86.25 CAD

$115.00

Up to 30% off select colors
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Full coverage

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Sporty scoop neckline

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Premium UPF 50+ fabric

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Machine washable

Jay is a 30F and wears a Knix size XS+ | Black

Jay is a 30F and wears a Knix size XS+

| Black
Jay is a 30F and wears a Knix size XS+ | Black

Jay is a 30F and wears a Knix size XS+

Jay is a 30F and wears a Knix size XS+ | Black

Jay is a 30F and wears a Knix size XS+

Jay is a 30F and wears a Knix size XS+

Absorbency: Essential

Essential
Drop
Drop
Drop
Drop
Drop
No Absorbency
Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons

Color: Black

Size:

True to Size

•

Size:

Size and Fit Guide

Free Shipping on orders $100+

Shipping

Shipping
Processing Timelines

Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order.

Delivery Time

For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges

Orders over $100* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.
*After discounts, before shipping and taxes.
Easy Returns within 30 Days

Returns

Returns
Free Returns

Knix covers the return shipping fees for exchanges and refunds initiated through our Return & Exchange Portal. Exchange orders initiated through our Return & Exchange portal are also eligible for free shipping within the USA and Canada. Please note, the shipping fees on your original order are non-refundable.

Return Policy

Return policy varies by product, please check if your item is refund or exchange eligible by viewing our full policy here.

Sale & Last Call

Items discounted below 30% are eligible for size exchange or store credit. Items discounted 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.
Rewards Members Earn 86 Points

"This swimsuit combines comfort, coverage, and confidence"

- Women's Health

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Swim in Style

A fit we've spent years perfecting.

Stay Sun-Safe

Premium UPF 50+ fabric shields you from UV rays while you relax, swim, and play.

Feels Made For You

Thicker, adjustable straps make it adaptable for different torso lengths. It features a shelf bra with removable cups and full bum coverage.

Zoom

Jay is a 30F and wears a Knix size XS+ | Black
| Black
Jay is a 30F and wears a Knix size XS+ | Black
Jay is a 30F and wears a Knix size XS+ | Black

How to Choose?

Essential

Drop
Drop
Drop
Drop
Drop
  • • Everyday Wear
  • • No leakproof protection
  • tsp
    0 tsp

Heavy

Drop
Drop
Drop
Drop
Drop
  • • heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    6-11 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 3-6 super tampons
  • cup
    about 1-2 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • sweat and discharge
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

Drop
Drop
Drop
Drop
Drop
  • • moderate period days
  • • light bladder leaks
  • • sweat
  • tsp
    about 3-6 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-3 super tampons
  • cup
    about 0.5-1 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    13-17 tsp
  • pad
    3.5-4.5 regular pads
  • tampon
    7-9 super tampons
  • cup
    2-3 menstrual cups

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4.5
Rated 4.5 out of 5 stars
Based on 127 reviews
Total 5 star reviews: 92 Total 4 star reviews: 18 Total 3 star reviews: 9 Total 2 star reviews: 3 Total 1 star reviews: 5
89%would recommend these products
ComfortRated 4.6 on a scale of 1 to 5
FitRated -0.0 on a scale of minus 2 to 2
SupportRated 4.1 on a scale of 1 to 5
Write a Review (Opens in a new window)
127 reviews
  • Rated 4 out of 5 stars
    4 weeks ago
    Favourite Suit

    I love the suit so much! I own it in two colours.

    It’s a super flattering fit while being extremely supportive and comfortable. I absolutely love that. They make a size small with large larger cups! I’ve never had a suit that fit so well.

    My only complaint about this colour is that the liner sometimes creates weird lines/strange looking, pleading in the crotch area.

    Still the best suit I’ve ever had!

    Laura S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Just a wee bit revealing down there.

    From the hips up, the fit is perfect and the look very flattering, but I am a senior and not as firm as I used to be. This suit that hugs in most of the right places also manages to be both too long below the hips and hug a bit too much down at the floppy nether regions - if I pull it up, CT; if I leave it long, droopy drawers. (I am broad-shouldered but short-waisted and narrow-hipped by comparison.) I have been wearing shorts or a long sun shirt when I am at a beach or on my paddleboard, but I wouldn't want to swim laps in a pool wearing shorts, so I will keep this suit for swimming wild. It is very supportive, though, and I can swim any stroke with the straps staying in place.

    Karin K.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 month ago
    Top discoloured

    I bought this before a trip to the sun earlier this year and loved the fit and support, however the area over where the pads are completely discoloured after only a few days. It’s maybe last years colour - a gorgeous robins egg blue, but now only good for use at home. Would give 5 stars otherwise.

    Freddy
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    4 Stars

    The cup liners in the bust tend to move around a lot when taking the suit on or off. Might just remove them altogether. Suit feels great otherwise. Not restrictive at all. Probably could have sized down but the sales associate said the suit does not tend to stretch much so went for comfort. Love the print and cut.

    Vita
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    It is buttery smooth and fits me so well. One-pieces can be not so cute but this is cute and fits so well

    Julia
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Another Knix win

    Love how thick the material is and for once I actually feel supported in a bathing suit. Would definitely reccommend!

    Caitlin E.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    This is my second one of these exact swimsuits and i will likely purchase a third! I tell everyone to buy a knix swimsuit.

    Brittany
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Classic one piece swimsuit

    Fits great and love the color!

    Angela S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Beautiful classic suit

    Love this suit . Quality is suberb. Fit is amazing. Love the cups for support. Beautiful classic suit!!

    Cindie S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Beautiful material

    Bought this suit for my daughter. This is 3rd knix bathing suit for her. Went down a size as she lost some wgt. Size small is perfect fit & she likes new limey green colour.

    Sheila H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Very comfortable

    Super comfortable and supportive. I have a short torso, so it was a little long but not as bad as others.

    Jenn S.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 month ago
    Poor design choices

    I loved the colour and the style. Unfortunately, it's unwearable for me because it's lacking two basic features: adjustable straps and proper lining. With the built-in bra in the right position, the straps dug painfully into my shoulders. The lining material is the same smooth material as the exterior, which means that everything underneath it is outlined uncomfortably clearly. I tried it on with underwear (as I always do) in case I needed to return it, and the outline was so extreme that I shudder to think what it would look like without that extra layer underneath. The built-in bra was also outlined in a way that made the suit look cheap. Usually swimwear is lined with that slightly rough black material, and I'm deducing that that's because it not only helps the suit stay on but also helps to obscure one's crotch. I'll be sad to return this beautiful chartreuse suit, but there's no way I could wear it comfortably.

    Hannah A.
    Verified Buyer
    Was this helpful?