Swim Trunk Size Chart and Fit Guide
Match your natural waist to the table to find your Tucann size. Trunks should sit snug, never digging in.
| Your natural waist | Tucann size |
|---|---|
| 29–31 in (74–79 cm) | S / 30 |
| 31–33 in (79–84 cm) | M / 32 |
| 33–35 in (84–89 cm) | L / 34 |
| 35–37 in (89–94 cm) | XL / 36 |
| 37–39 in (94–99 cm) | XXL / 38 |
Between sizes? Size up for a relaxed fit or down for a snug fit.
Not sure of your waist? Use the size finder · Full size chart (men’s, women’s, kids’)
Reviewed by the Tucann team · Updated October 2026
Find your size
Answer a few quick questions and we'll recommend your ideal Tucann swim size.
Who are you shopping for?
We'll customize the size recommendations for you.
What are you shopping for?
We'll tailor the recommendation to the style.
What's your bust measurement?
Wrap the tape around the fullest part of your bust, keeping it level across your back.
What's your waist measurement?
Measure around the narrowest part of your natural waistline — usually just above the belly button.
How much coverage do you prefer?
This helps us recommend the right style and cut.
How do you like your fit?
This fine-tunes your size if you're between two.
What's your waist measurement?
Measure around your natural waistline, where you'd normally wear your trunks.
How do you like your fit?
This fine-tunes your size if you're between two.
You're a Medium
Size chart
This men's swim trunks size chart matches your natural waist to a Tucann size, in inches and centimeters. Use it as your swim shorts size chart for Tucann men's swim trunks in every length. The S, M, L, XL and XXL labels map to waist sizes 30, 32, 34, 36 and 38, so an L is a 34, not a 36.
Short on time? Use the quick lookup at the top of the page.
Men’s swim trunk size chart (and swim shorts size chart)
| Size | Waist | 3″ inseam | 5″ inseam | 7″ inseam | Front rise |
|---|---|---|---|---|---|
| S / 30 | 29 – 3174 – 79 | 37.6 | 512.7 | 717.8 | 10.526.7 |
| M / 32 | 31 – 3379 – 84 | 37.6 | 512.7 | 717.8 | 1127.9 |
| L / 34 | 33 – 3584 – 89 | 37.6 | 512.7 | 717.8 | 11.529.2 |
| XL / 36 | 35 – 3789 – 94 | 37.6 | 512.7 | 717.8 | 1230.5 |
| XXL / 38 | 37 – 3994 – 99 | 37.6 | 512.7 | 717.8 | 12.531.8 |
Men's swim trunks size chart: natural waist and front rise by size. Inseams are the same in every size: 3″ (7.6 cm), 5″ (12.7 cm) and 7″ (17.8 cm). The 5″ outseam in size M is 16″.
Waist under 29 in: the size finder recommends S. Waist 37 in and over: XXL.
Between sizes? Size up for a relaxed fit or down for a snug fit.
Men’s sport: shorts, T-shirts & polos
| Size | Chest | Waist | Shirt length | Sleeve |
|---|---|---|---|---|
| S | 36 – 3891 – 97 | 29 – 3174 – 79 | 2768.6 | 820.3 |
| M | 38 – 4097 – 102 | 31 – 3379 – 84 | 2871.1 | 8.521.6 |
| L | 40 – 42102 – 107 | 33 – 3584 – 89 | 2973.7 | 922.9 |
| XL | 42 – 44107 – 112 | 35 – 3789 – 94 | 3076.2 | 9.524.1 |
| XXL | 44 – 46112 – 117 | 37 – 3994 – 99 | 3178.7 | 1025.4 |
Sport pieces are designed for an athletic, modern fit. Hoodies and singlets follow the same S–XXL sizing. If you prefer a looser training fit, consider sizing up.
Men’s underwear
| Size | Waist | Leg opening |
|---|---|---|
| S | 29 – 3174 – 79 | 2153.3 |
| M | 31 – 3379 – 84 | 2255.9 |
| L | 33 – 3584 – 89 | 2358.4 |
| XL | 35 – 3789 – 94 | 2461 |
| XXL | 37 – 3994 – 99 | 2563.5 |
Our underwear is designed for a supportive, body-hugging fit. We recommend going with your standard waist size, no need to size up.
Women’s size charts
Women's swimwear sizes for bikini tops, bikini bottoms and one-pieces. Measure, then match each piece to its chart.
Bikini tops
| Size | Bust | Under bust | Cup |
|---|---|---|---|
| XS | 30 – 3276 – 81 | 26 – 2866 – 71 | A – B |
| S | 32 – 3481 – 86 | 28 – 3071 – 76 | B – C |
| M | 34 – 3686 – 91 | 30 – 3276 – 81 | C – D |
| L | 36 – 3891 – 97 | 32 – 3481 – 86 | D – DD |
| XL | 38 – 4097 – 102 | 34 – 3686 – 91 | DD – E |
Bikini bottoms & one-pieces
| Size | Waist |
|---|---|
| XS | 24 – 2661 – 66 |
| S | 26 – 2866 – 71 |
| M | 28 – 3071 – 76 |
| L | 30 – 3276 – 81 |
| XL | 32 – 3481 – 86 |
For one-piece swimsuits, size to fit the larger measurement between your top and bottom sizes.
Kids’ size chart
Kids' swim trunk sizes by age, with measurements to check against.
| Size | Age range | Waist | Height |
|---|---|---|---|
| 2 | 2 yrs | 20 – 2151 – 53 | 33 – 3684 – 91 |
| 4 | 3 – 4 yrs | 21 – 2253 – 56 | 37 – 4194 – 104 |
| 6 | 5 – 6 yrs | 22 – 2356 – 58 | 42 – 46107 – 117 |
| 8 | 7 – 8 yrs | 23 – 2458 – 61 | 47 – 51119 – 130 |
| 10 | 9 – 10 yrs | 24 – 2661 – 66 | 52 – 57132 – 145 |
If your child is between sizes or growing quickly, we recommend sizing up.
How to measure
Find your natural waist
Wrap the tape around your natural waist, where you normally wear jeans, pants or shorts. This is where the waistband sits.
Choose your inseam
3″ sits well above the knee for a bold, modern look. 5″ hits mid-thigh and is our most popular. 7″ reaches just above the knee for classic coverage.
Match to the chart
Match your waist to the size chart above, then pick your length with the slider.
Quick answers: 34 waist, XL and large
What size swim trunks for a 34 waist?
A 34-inch waist is an L / 34 in Tucann swim trunks, which fits a 33–35 inch natural waist (84–89 cm). Measure your natural waist with a tape rather than going by the size on your jeans label, since jeans labels don't always match a tape measure.
What size is XL in men's swim trunks?
XL is a 36 in Tucann men's swim trunks. It fits a 35–37 inch waist (89–94 cm). The letter sizes map to waist sizes: S is 30, M is 32, L is 34, XL is 36 and XXL is 38.
What size are large swim trunks?
Large is an L / 34 in Tucann swim trunks. It fits a 33–35 inch waist (84–89 cm).
Between sizes?
If you're between sizes, size up for a relaxed feel or size down for a closer, athletic fit. The semi-elastic waistband and adjustable drawstring give you control within each size. Fit is mostly about your waist measurement, then the inseam.
Still unsure?
Tap the chat icon in the bottom right corner and our team will help you find the right size from your measurements.
What our models wear
| Model | Height | Weight | Size | Length |
|---|---|---|---|---|
| Nick | 5′10″178 cm | 180 lbs82 kg | M | 5″ |
| Diogo | 6′0″184 cm | 163 lbs74 kg | M | 5″ |
| Alex | 6′2″188 cm | 200 lbs91 kg | L | 5″ |
Find your length
Slide between 3″, 5″ and 7″ and see where the hem lands on our model, measured against the size chart.
- Inseam
- 5″
- Outseam (M)
- 16″
- Front rise (M)
- 11″
Real photos of the same model (Nick, 5′10″, size M) in Royal Blue, lined up on the top of the waistband. The line marks where each hem lands, measured on the photo. Outseam is measured from the waistband, size M, from our size chart. Poses differ between shots, and where a hem lands also depends on your proportions.
Pick your length: 3″, 5″ or 7″
Pick your length by where you want the hem to sit: 3″ well above the knee, 5″ mid-thigh, 7″ just above the knee.
| Inseam | Where it sits | Pick it if |
|---|---|---|
| 3″ | Well above the knee, for a bold, modern look | You want the shortest, boldest cut |
| 5″ | Hits mid-thigh; our most popular | You want the middle ground (outseam 16″ and front rise 11″ in size M) |
| 7″ | Just above the knee, for classic coverage | You prefer more coverage |
For reference, our model Nick is 5′10″ and wears an M in the 5″. Compare lengths side by side in 5-inch vs 7-inch swim trunks, or read how long your swim trunks should be.
How should swim trunks fit?
Swim trunks should sit snug at your waist without digging in, with the drawstring fine-tuning the fit rather than holding them up. The leg shouldn't pull or flap, and a compression liner should lie flat and feel supportive, not tight. For Tucann trunks, match your natural waist to the chart: a 33–35 inch waist is an L / 34.
Five quick fit checks for your first try-on
- Waist. Snug and flat against your body, with no digging in. A good rule of thumb: you should be able to slide two fingers under the waistband.
- Drawstring. As a general rule, the drawstring is for fine-tuning, not for holding your trunks up. Tucann trunks have a drawstring front with an elastic back.
- Seat and thighs. You can sit, squat and stride without the fabric pulling.
- Hem. It lies flat on your thigh. No flapping, no cutting in.
- Liner. A good liner lies flat, without gaps or bunching, and feels supportive, not tight. More in How should a compression liner fit? below.
For reference, our model Nick is 5′10″ and wears an M in the 5″. Compare lengths side by side in 5-inch vs 7-inch swim trunks, or read how long your swim trunks should be.
How should a compression liner fit?
As a good rule of thumb, a compression liner should feel snug and supportive and sit close to your body, but it should never be tight enough to dig in or leave marks, and it should stay in place when you move. Think of a close-fitting short. No bunching, no gaps, no riding up. You should be able to walk, sit and swim without adjusting anything.
Every Tucann men's swim trunk, in 3″, 5″ and 7″, has the Aqua-Liner built in. It's a compression liner made from the same four-way stretch swim fabric as the shell, and it replaces underwear.
See how the Aqua-Liner works, compare compression vs mesh liners, or shop compression-lined swim trunks.
No underwear needed
No underwear needed. Our Aqua-Liner (compression inner) replaces underwear. It is designed for water, comfort and support.
Buying for someone else? How to size a gift
Gift sizing comes down to one number: his natural waist. If you know a pair he already wears, check its waist size and match it to the chart above. If you can't, ask him or estimate, and choose the 5″, our most popular length. The semi-elastic waistband and adjustable drawstring give some give within each size.
Buying matching sets? Size each person separately. Browse couples matching swimwear or matching father-son swim trunks.
Got the size wrong? You can exchange it within 30 days of receiving your order. Our returns page explains how exchanges work, and the refund policy has the full details. Read both before you buy a gift. Free US shipping on orders over $100.
Easy size exchanges
Wrong size? Swap it within 30 days of receiving your order. Start an exchange from our returns page. The refund policy has the full details.
From the day you receive your order. Items must be new and unused, with all tags attached.
Refunds for wrong size or change of mind, with return postage at your expense. Free returns on exchanges.
Store credit for all returns and exchanges. Return shipping is at your cost.
Swim trunk sizing FAQ
How should swim trunks fit?
Snug at the waist without digging in, with the drawstring used for fine-tuning. The leg shouldn't pull or flap, and the liner should lie flat and feel supportive, not tight. For Tucann trunks, match your natural waist to the chart.
Should swim shorts be tight or loose?
Neither. They should be snug at the waist and easy through the leg. Tight enough to stay up without cinching the drawstring, loose enough to move.
Are swim trunks supposed to be tight?
No. A compression liner feels snug by design, but the outer shell should never pull or dig in. If the shell feels tight across the seat or thighs, try the next size up.
What size swim trunks for a 34 waist?
L / 34, which fits a 33–35 inch natural waist (84–89 cm). Measure your natural waist with a tape rather than relying on your jeans label.
What size is XL in men's swim trunks?
XL / 36, which fits a 35–37 inch waist (89–94 cm). Tucann letter sizes map to waist sizes, so an L is a 34 and an XL is a 36.
Should I size up or down?
Size up for a relaxed feel, or size down for a closer, athletic fit. The semi-elastic waistband and adjustable drawstring give you control within each size.
How should a compression liner fit?
Snug and supportive, close to your body, with no bunching or gaps, and never digging in. It should stay in place when you walk, sit and swim. The Aqua-Liner in every Tucann men's swim trunk replaces underwear.
What if I order the wrong size?
You can exchange it within 30 days of receiving your order. Start from our returns page, and see the refund policy for the full details.
Do swim trunks run small?
Sizing varies by brand, so go by measurements, not labels. Match your natural waist to the chart, not your usual shirt size.
Measure your natural waist, match the chart, choose your length. Between sizes? Size up for a relaxed fit or down for a snug fit.
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