Make it count.
Every piece sets aside a dollar amount toward humanitarian causes. You see it before you buy.
Two numbers, both real.
Two numbers on every price. The crossed-out one is retail.
New pieces and labels weekly.
New pieces and new labels every week. Returns on us for 30 days.
C-IN2 New York Flex Trunk black men's underwear with contoured pouch and low-rise waistband
C-IN2 New York Flex Trunk black men's underwear with contoured pouch and sleek fitted design
C-IN2 New York Flex Trunk black men's underwear, front view
C-IN2 New York Flex Trunk black men's underwear, front view
C-IN2 New York Flex Trunk black men's underwear front view
C-IN2 New York Flex Trunk black men's underwear
C-IN2 New York Flex Trunk black men's underwear with contoured pouch and low-rise waistband
C-IN2 New York Flex Trunk black men's underwear with contoured pouch and sleek fitted design
C-IN2 New York Flex Trunk black men's underwear, front view
C-IN2 New York Flex Trunk black men's underwear, front view
C-IN2 New York Flex Trunk black men's underwear front view
C-IN2 New York Flex Trunk black men's underwear

Product Details

The trunk that stays cool.

Square cut, short leg, full airflow. The Flex Trunk takes the most wearable silhouette in underwear and knits it in breathable cotton-modal mesh — a compact 3" inseam that stays cool and never bunches.

Fabric
57% Cotton, 38% Modal, 5% Elastane. Airy mesh knit with 4-way stretch — modal makes it softer than plain cotton, and the mesh keeps air moving against the skin.

Fit & Silhouette
Men's mid-rise mesh trunk — sits at the natural waistline with a 3" inseam for compact, balanced coverage.

Contour Pouch
2-ply contour pouch — sculpted support with natural lift.

Leg Bands
Smooth microfiber leg bands sit flat against the thigh — no ride-up, no bunching.

Waistband
1.5" elastic waistband with C-IN2 branding — soft hold, clean finish.

Fit note
True to size. For a looser fit, go one size up.

Care
Machine wash.
Imported.

Flex

Everyday basics in an airy cotton-modal mesh with 4-way stretch — softer than plain cotton, cooler than anything else in the drawer. Light layers for warm days and long ones.

New

Flex Trunk Black

by C-IN2 New York
$34

Pricing that's straightforward.

One number sits on this page: ours, set once and left alone. Nothing hides behind it. We call it DY Pure.

On this page What it is
$34 Ours. Set once, and we stand behind it.
DY Pure. Nothing is hiding behind the number.
Our philanthropic promise $2.38 A fixed dollar amount from this piece, set aside for our philanthropic programs.
Where it comes from

It's less of a pricing method and more of a business philosophy. Strangely enough, I learned it from a woman who sold cars.

Her family ran dealerships in Colorado for decades. When it became time for her to run the business, she thought about what buying a car had felt like for her. The anxiety of not knowing whether she was getting the right deal. The doubt about whether she could hold her own in a negotiation. The hours it took. She wanted to do it differently.

Everyone knows the number on a car's window isn't real. She decided she didn't want to do business that way, and she made the number real. The price on the car was the price. No haggling, no salesman stepping out to talk to a manager. One person looked after you from the first handshake to the keys, and you were out the door.

The philosophy was simple. A business is allowed to make a profit. A customer is allowed to save some money. That is how the relationship with the businesses you spend your money with should be.

Because of this philosophy, I bought six cars from her over the years. It was simple. It took the anxiety out of deciding. And it built a relationship that still rings true all these years later.

It wasn't because of the deal, though the deals were always fair. It was because I never had to wonder whether I had been played. I trusted them. I went back, and I sent everyone I knew.

The business we have built

That's the business we built here. Something you love, priced properly, with retail beside it so you can see what you saved, and a fixed dollar amount from every piece set aside for our philanthropic programs. Numbers you never have to question.

Why we price this way

Retail likes to raise a price so it can mark it down and call it a sale. We'd rather earn your next visit.

That is DY Pure.

No reviews yet
Our philanthropic promise $2.38
Where the money goes
Set aside the moment this sells, for our philanthropic programs. Allocated publicly at each milestone and reported on the tracker. Decided before you buy, and it doesn't change after. How it works
New with tags. Always.
Never secondhand, except verified vintage, labeled as such.
Authentic. Always.
Designer pieces, never from marketplaces or individuals. Independent brands, direct from the maker.
A person answers. Always.
Text us anytime. Twenty years in the best rooms behind every reply. Ask us
Size Guides

Size Guide

Pick a category, find your usual size in the first column, then read across for the same size in other countries. Each table starts with body measurements so you can size from a tape measure. Where a product uses the brand's own scale, the label on that product page takes priority.

How to measure

Use a soft tape over light clothing. Keep it level and snug, not tight. Between sizes? Take the larger for outerwear, the smaller for close-fitting knits and swim.

Measurement How to take it
Chest / Bust Around the fullest part of the chest, tape under the arms and across the shoulder blades
Waist Around the natural waist, the narrowest point above the hip bones
Hips Around the fullest part of the hips and seat, feet together
Inseam From the top of the inner thigh to the ankle bone, standing straight
Foot length Stand on paper, heel to a wall, mark the longest toe; measure heel to mark. Use the longer foot
Head Around the head where a hat sits, about 1 cm (½ in) above the ears and eyebrows
Hand Around the palm at the knuckles, excluding the thumb, dominant hand
Finger Wrap paper around the finger, mark the overlap, measure in mm; or the inside diameter of a ring that fits

Measure feet and fingers at the end of the day, when they are largest.

Women's clothing

Tops, dresses, knitwear and outerwear. Size by bust.

Swipe sideways to see every column →

Size Bust in Bust cm Waist in Waist cm Hips in Hips cm US UK/AU EU/FR IT DE JP
XXS 31.5 80 24 61 34 86 0 4 32 36 30 5
XS 32.5 83 25 64 35 89 2 6 34 38 32 7
S 33.5 85 26 66 36 91 4 8 36 40 34 9
S 34.5 88 27 69 37 94 6 10 38 42 36 11
M 35.5 90 28 71 38 97 8 12 40 44 38 13
M 36.5 93 29 74 39 99 10 14 42 46 40 15
L 38 97 30.5 77 40.5 103 12 16 44 48 42 17
L 39.5 100 32 81 42 107 14 18 46 50 44 19
XL 41 104 33.5 85 43.5 110 16 20 48 52 46 21
XXL 43 109 35.5 90 45.5 116 18 22 50 54 48 23

Italian sizes run two numbers above French: a French 38 is an Italian 42. Japanese sizes run small; when in doubt go up one.

Women's bottoms, underwear & swim

Pants, shorts & skirts

Swipe sideways to see every column →

Size Waist in Waist cm Hips in Hips cm US UK/AU EU/FR IT Jeans
XXS 24 61 34 86 0 4 32 36 24
XS 25 64 35 89 2 6 34 38 25
S 26 66 36 91 4 8 36 40 26
S 27 69 37 94 6 10 38 42 27
M 28 71 38 97 8 12 40 44 28
M 29 74 39 99 10 14 42 46 29
L 30.5 77 40.5 103 12 16 44 48 30
L 32 81 42 107 14 18 46 50 32
XL 33.5 85 43.5 110 16 20 48 52 33
XXL 35.5 90 45.5 116 18 22 50 54 35

Underwear, bikinis & one-pieces

Swipe sideways to see every column →

Size Hips in Hips cm US dress UK/AU EU/FR IT Panty (US)
XS 34–35 86–89 0–2 4–6 32–34 36–38 5
S 36–37 91–94 4–6 8–10 36–38 40–42 6
M 38–39 97–99 8–10 12–14 40–42 44–46 7
L 40.5–42 103–107 12–14 16–18 44–46 48–50 8
XL 43.5–45.5 110–116 16–18 20–22 48–50 52–54 9

Bikini tops with cup sizes use bra sizing: band is underbust in inches rounded to the nearest even number; cup is bust minus band (1 in = A, 2 = B, 3 = C, 4 = D).

Men's clothing

T-shirts, shirts, knitwear, hoodies and jackets. Size by chest.

Swipe sideways to see every column →

Size Chest in Chest cm Waist in Waist cm Neck in Neck cm US/UK/AU EU/IT/FR DE JP
XS 34–36 86–91 28–30 71–76 14–14.5 36–37 XS 44 44 S
S 36–38 91–97 30–32 76–81 15–15.5 38–39 S 46 46 M
M 38–40 97–102 32–34 81–86 15.5–16 39–41 M 48 48 L
L 40–42 102–107 34–36 86–91 16.5–17 42–43 L 50 50 LL
XL 42–44 107–112 36–38 91–97 17.5–18 44–46 XL 52 52 3L
XXL 44–46 112–117 38–40 97–102 18.5–19 47–48 XXL 54 54 4L
3XL 46–48 117–122 40–42 102–107 19–19.5 48–50 3XL 56 56 5L

Italian designer pieces are often labelled by EU number only (46, 48, 50). Japanese letter sizes run one size smaller than US.

Men's bottoms, underwear & swim

Pants, shorts & joggers

Swipe sideways to see every column →

Size Waist in Waist cm Hips in Hips cm US/UK/AU EU/IT/FR DE JP
XS 28 71 34–35 86–89 28 44 44 73
S 30 76 36–37 91–94 30 46 46 76
M 32 81 38–39 97–99 32 48 48 82
M 33 84 39–40 99–102 33 49 49 85
L 34 86 40–41 102–104 34 50 50 88
L 36 91 42–43 107–109 36 52 52 91
XL 38 97 44–45 112–114 38 54 54 97
XXL 40 102 46–47 117–119 40 56 56 102
3XL 42 107 48–49 122–124 42 58 58 107

Inseam: short 30 in (76 cm), regular 32 in (81 cm), long 34 in (86 cm).

Underwear, swim briefs, trunks & swim shorts

Swipe sideways to see every column →

Size Waist in Waist cm US/UK EU IT FR JP
XS 26–28 66–71 XS 3 2 1 S
S 28–30 71–76 S 4 3 2 M
M 30–33 76–84 M 5 4 3 L
L 33–36 84–91 L 6 5 4 LL
XL 36–39 91–99 XL 7 6 5 3L
XXL 39–42 99–107 XXL 8 7 6 4L

Briefs, thongs, jocks and swim tangas are cut to fit snugly; stay with your measured size.

Women's shoes

Size by foot length; the chart allows about 1 cm (⅜ in) beyond the toe.

Swipe sideways to see every column →

Foot in Foot cm US UK EU IT JP cm AU
8.5 21.6 5 3 35.5 35 22 5
8.7 22.0 5.5 3.5 36 35.5 22.5 5.5
8.9 22.5 6 4 36.5 36 23 6
9.0 22.9 6.5 4.5 37 36.5 23.5 6.5
9.25 23.5 7 5 37.5 37 24 7
9.4 23.9 7.5 5.5 38 37.5 24.5 7.5
9.6 24.4 8 6 38.5 38 25 8
9.75 24.8 8.5 6.5 39 38.5 25.5 8.5
9.9 25.2 9 7 39.5 39 26 9
10.1 25.7 9.5 7.5 40 39.5 26.5 9.5
10.25 26.0 10 8 40.5 40 27 10
10.4 26.4 10.5 8.5 41 40.5 27.5 10.5
10.6 26.9 11 9 41.5 41 28 11
10.75 27.3 11.5 9.5 42 41.5 28.5 11.5
10.9 27.8 12 10 42.5 42 29 12

Italian-made shoes often run a half size small against the EU standard; use the IT column for Italian brands. Width: standard B / medium, wide D / W.

Men's shoes

Size by foot length; the chart allows about 1 cm (⅜ in) beyond the toe.

Swipe sideways to see every column →

Foot in Foot cm US UK EU IT JP cm AU
9.25 23.5 6 5 39 38.5 24 5
9.4 23.9 6.5 5.5 39.5 39 24.5 5.5
9.6 24.4 7 6 40 39.5 25 6
9.75 24.8 7.5 6.5 40.5 40 25.5 6.5
9.9 25.2 8 7 41 40.5 26 7
10.1 25.7 8.5 7.5 42 41 26.5 7.5
10.25 26.0 9 8 42.5 41.5 27 8
10.4 26.4 9.5 8.5 43 42 27.5 8.5
10.6 26.9 10 9 43.5 42.5 28 9
10.75 27.3 10.5 9.5 44 43 28.5 9.5
10.9 27.8 11 10 44.5 43.5 29 10
11.1 28.2 11.5 10.5 45 44 29.5 10.5
11.25 28.6 12 11 46 44.5 30 11
11.4 29.0 12.5 11.5 46.5 45 30.5 11.5
11.6 29.4 13 12 47 45.5 31 12
11.9 30.2 14 13 48.5 46.5 32 13

UK and Australian men's sizes are one number below US. Width: standard D / medium, wide EE / W.

Accessories

Hats & headwear

Swipe sideways to see every column →

Size Head in Head cm Fitted (US) UK
XS 20.5–21 52–53 6½ – 6⅝ 6⅜ – 6½
S 21.25–21.75 54–55 6¾ – 6⅞ 6⅝ – 6¾
M 22–22.5 56–57 7 – 7⅛ 6⅞ – 7
L 22.75–23.25 58–59 7¼ – 7⅜ 7⅛ – 7¼
XL 23.5–24 60–61 7½ – 7⅝ 7⅜ – 7½
XXL 24.5–25 62–63 7¾ – 7⅞ 7⅝ – 7¾

Snapbacks and adjustable caps fit S through L in one size.

Belts

Choose a belt two inches (5 cm) above your pant waist so it buckles on the middle hole.

Swipe sideways to see every column →

Pant waist in Belt in Belt cm Size
28 30 75 XS
30 32 80 S
32 34 85 S / M
34 36 90 M
36 38 95 L
38 40 100 L / XL
40 42 105 XL
42 44 110 XXL

Gloves & mittens

Swipe sideways to see every column →

Size Hand in Hand cm Men's Women's
XS 6–6.5 15–16.5 – 6
S 6.5–7 16.5–18 7 6.5
M 7–7.5 18–19 7.5 7
M / L 7.5–8 19–20.5 8 7.5
L 8–8.5 20.5–21.5 8.5 8
XL 8.5–9 21.5–23 9 –
XXL 9–9.5 23–24 9.5 –

Socks

Swipe sideways to see every column →

Size Men's US shoe Women's US shoe EU shoe
S 3–6 4–7 35–38
M 6–9 7–10 39–42
L 9–12 10–13 43–46
XL 12–15 – 47–50

Rings

Measure the inside diameter of a ring that fits, or your finger's circumference in mm. Knuckle size matters more than the base of the finger.

Swipe sideways to see every column →

Diameter mm Circ. mm US/CA UK/AU EU/ISO FR / IT JP
14.9 46.8 4 H 47 7 7
15.3 48.0 4.5 I 48 8 8
15.7 49.3 5 J½ 49 9 9
16.1 50.6 5.5 K½ 51 10.5 10
16.5 51.9 6 L½ 52 12 11
16.9 53.1 6.5 M½ 53 13 12
17.3 54.4 7 N½ 54 14.5 14
17.7 55.7 7.5 O½ 56 15.5 15
18.1 57.0 8 P½ 57 17 16
18.5 58.3 8.5 Q½ 58 18 17
18.9 59.5 9 R½ 59 19.5 18
19.4 60.8 9.5 S½ 61 21 19
19.8 62.1 10 T½ 62 22 20
20.2 63.4 10.5 U½ 63 23.5 22
20.6 64.6 11 V½ 65 24.5 23
21.0 65.9 11.5 W½ 66 26 24
21.4 67.2 12 X½ 67 27 25
21.8 68.5 12.5 Z 68 28.5 26
22.2 69.7 13 Z½ 70 29.5 27

Bags, wallets, scarves, sunglasses and other jewelry are one size; dimensions are on each product page.

Quick rules & fit notes
From To Rule
US women's dress UK / AU Add 4
US women's dress EU / FR Add 32
US women's dress IT Add 36
FR IT Add 4
US men's chest (in) EU / IT Add 10
US men's waist (in) EU / IT Add 16
US men's shoe UK Subtract 1
US women's shoe UK Subtract 2
US men's shoe EU Add 33
US women's shoe EU Add 31
Any shoe JP Foot length in cm
Pant waist (in) Belt (in) Add 2

Fit by product type

Product Fit If between sizes
Outerwear, hoodies, sweatshirts Relaxed, room for a layer Size up
T-shirts, tanks, polos True to size Stay
Performance & activewear Close to the body Size down
Underwear, briefs, swim Snug Stay
Dresses, skirts True to size Size by the larger of bust or hips
Jeans True to size; stretch relaxes with wear Size down for stretch denim
Shoes True to size Up for a thick sock, down for a narrow foot

Unisex and lifestyle pieces are cut to men's sizing; women typically take one size down.

 
Shipping calculated at checkout.

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Product Details

The trunk that stays cool.

Square cut, short leg, full airflow. The Flex Trunk takes the most wearable silhouette in underwear and knits it in breathable cotton-modal mesh — a compact 3" inseam that stays cool and never bunches.

Fabric
57% Cotton, 38% Modal, 5% Elastane. Airy mesh knit with 4-way stretch — modal makes it softer than plain cotton, and the mesh keeps air moving against the skin.

Fit & Silhouette
Men's mid-rise mesh trunk — sits at the natural waistline with a 3" inseam for compact, balanced coverage.

Contour Pouch
2-ply contour pouch — sculpted support with natural lift.

Leg Bands
Smooth microfiber leg bands sit flat against the thigh — no ride-up, no bunching.

Waistband
1.5" elastic waistband with C-IN2 branding — soft hold, clean finish.

Fit note
True to size. For a looser fit, go one size up.

Care
Machine wash.
Imported.

Flex

Everyday basics in an airy cotton-modal mesh with 4-way stretch — softer than plain cotton, cooler than anything else in the drawer. Light layers for warm days and long ones.

Dark Yarn is an independent retailer. C-IN2 New York is not affiliated with Dark Yarn or its philanthropic programs.

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