Name: Zen Modal Horizontal Fly Brief
Brand: Jack Adams
SKU: 401-357-blk01
Price: 32.0 USD
Availability: InStock

Man wearing a pair of black Jack Adams Zen Modal Horizontal Fly Briefs (back view) in front of white background

$32.00

Shipping calculated at checkout.

Size

Color — Black

Black

Grey

Pacific Blue

Peacoat Blue

In stock, ready to ship
Backordered, shipping soon

Zen Modal Brief delivers a clean, supportive fit, cooling performance, and a silky-soft feel that makes it a standout everyday essential. Crafted from lightweight TENCEL™ Modal, the fabric is exceptionally breathable, moisture‑wicking, quick‑drying, and smooth against the skin—creating that barely‑there comfort men look for in premium modal underwear. The original horizontal fly offers fast, easy access, while the contour pouch gently lifts and supports for a natural, secure fit. With its low‑bulk silhouette, cool‑to‑the‑touch fabric, and all‑day comfort, this brief is ideal for men searching for soft modal briefs, horizontal fly underwear, no‑ride support, and lightweight men's underwear that feels like wearing nothing at all. Shop the collection.

SIZE - True to size

Brief underwear
Sits at the natural waistline.
Horizontal Fly is a solution to the ‘fly fishing' caused by vertical and no-fly underwear. A uniquely intuitive horizontal opening for fast and easy access when nature calls.
Supportive pouch design for men who need more support and comfort.
Chafe-free flatlock stitching.
Ultra soft, smooth feel.
No-roll elastic waistband
Size: Model is 6’ 1” and is wearing a size medium

Fabric 95% Modal, 5% Elastane
Shrinkage and pilling resist.
Machine wash cold water. Do not bleach. Hang to dry.

Get free shipping for US orders over $125+

Discreet packaging: plain poly bag or brown box.

-Shipping Details

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{"id":47467905974484,"title":"S \/ Black","option1":"S","option2":"Black","option3":null,"sku":"401-357-blk01","requires_shipping":true,"taxable":false,"featured_image":{"id":46072856477908,"product_id":9047145709780,"position":4,"created_at":"2026-01-22T07:16:15-08:00","updated_at":"2026-03-29T15:16:30-07:00","alt":"Man wearing a pair of black Jack Adams Zen Modal Horizontal Fly Briefs( profile view) in front of white background","width":684,"height":1026,"src":"\/\/jackadamsusa.com\/cdn\/shop\/files\/JackAdams_IMG_2177_401-357_Zen_Modal_Brief_Black_Profile_Web__59831.1729824234.1280.1280.jpg?v=1774822590","variant_ids":[47467905974484,47467906007252,47467906040020,47467906072788]},"available":true,"name":"Zen Modal Horizontal Fly Brief - S \/ Black","public_title":"S \/ Black","options":["S","Black"],"price":3200,"weight":91,"compare_at_price":3200,"inventory_management":"shopify","barcode":"747442068891","featured_media":{"alt":"Man wearing a pair of black Jack Adams Zen Modal Horizontal Fly Briefs( profile view) in front of white background","id":37372577120468,"position":5,"preview_image":{"aspect_ratio":0.667,"height":1026,"width":684,"src":"\/\/jackadamsusa.com\/cdn\/shop\/files\/JackAdams_IMG_2177_401-357_Zen_Modal_Brief_Black_Profile_Web__59831.1729824234.1280.1280.jpg?v=1774822590"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

Jack Adams™ underwear and shorts/pants sizing is measured at the waist. To find your correct waist size, measure your torso about one inch below the belly button. To find your size in all of our tops and hoodies, measure your chest around, at approximately one inch below your arm pit.

Size Chart - INCHES

SIZES (inches)	S	M	L	XL	XXL
CHEST	35-37	38-40	41-43	44-47	N/A
NECK	14-14.5	15-15.5	16-16.5	17-17.5	N/A
WAIST	27-29	30-32	33-35	36-38	38-43

Size Chart - METRIC

SIZES (cm)	S	M	L	XL	XXL
CHEST	89-94	97-101	104-109	112-118	N/A
NECK	36-37	38-39	41-42	43-44	N/A
WAIST	69-73	76-81	84-89	91-97	97-109

5 stars: 5 (83%)
4 stars: 1 (17%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Really like the horizontal fly much easier to navigate then the traditional fly. Looks and fits great.

They are comfortable, lite as if forget you are wearing them

Thank you, Dana, for your kind words! We're delighted to hear that you find the Zen Modal Horizontal Fly Brief so comfortable. We appreciate your support!

ZEN Brief

Very comfortable, light weight, true to size.
Like the horizontal fly!

Awesome Underwear

I would Recommend Jack Adam’s to all my Friends ,they are so there underwear is so awesome,

Love em

I'm not usually a "briefs" person, but they looked so comfortable I decided to give them a try. So comfortable!!!!

The most comfortable brief

This is the most comfortable brief I have ever worn