What you wear underneath is a reflection of how you feel on the outside.

Men's Underwear

What you wear underneath is a reflection of how you feel on the outside.

What you wear underneath is a reflection of how you feel on the outside.

Of course, your mood changes every day, so that's why DownUnder Apparel makes sure we have a huge variety of styles of Men's underwear and Men's sleepwear to fit any mood you're in! Find men's briefs, boxer briefs, boxers, trunks, thongs, jockstraps, and unique sexy underwear from the top brands.

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Papi Papi UMPA088 2PK Microflex Brazilian Boxer Briefs Color Blue-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
Save 33%
Papi Papi UMPA081 2PK Microflex Jockstrap Color Tropical-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA081 2PK Microflex Jockstrap Color Pink-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA088 2PK Microflex Brazilian Boxer Briefs Color Turquoise-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA081 2PK Microflex Jockstrap Color Alloy-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA080 2PK Microflex Brazilian Trunks Color Pink-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA080 2PK Microflex Brazilian Trunks Color Alloy-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
Save 33%
Papi Papi UMPA081 2PK Microflex Jockstrap Color Waves-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Papi Papi UMPA087 2PK Microflex Jockstrap Color Blue-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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HAWAI HAWAI 42141 Microfiber Briefs Color Pink
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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HAWAI HAWAI 41961 Microfiber Briefs Color Pink
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,500
Unit Price
per 
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HAWAI HAWAI 41961 Microfiber Briefs Color Light Blue
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,500
Unit Price
per 
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HAWAI HAWAI 42141 Microfiber Briefs Color Light Blue
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
SOLD OUT
Xtremen Xtremen 91107 Protuder Jockstrap Color Navy
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
SOLD OUT
Xtremen Xtremen 91108 C-Ring Harness Color Red
Regular Price
¥3,600
Sale Price
¥3,600
Regular Price
¥5,500
Unit Price
per 
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Clever Clever 0900 Lighting Briefs Color Gray
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
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Clever Clever 0902 Lighting Jockstrap Color Gray
Regular Price
¥3,000
Sale Price
¥3,000
Regular Price
¥4,600
Unit Price
per 
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Roger Smuth Roger Smuth RS060 Trunks Color Burgundy
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
Save 14%
Roger Smuth Roger Smuth RS068 Thongs Color Red
Regular Price
¥3,200
Sale Price
¥3,200
Regular Price
¥3,700
Unit Price
per 
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Unico Unico 22120100208 Asfalto M22 Boxer Briefs Color 96-Dark Gray
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥4,800
Unit Price
per 
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Unico Unico 22110100103 Astros Trunks Color 90-Black
Regular Price
¥3,800
Sale Price
¥3,800
Regular Price
¥4,500
Unit Price
per 
Save 15%
Unico Unico 22110100201 Naviero Boxer Briefs Color 29-White
Regular Price
¥4,500
Sale Price
¥4,500
Regular Price
¥5,300
Unit Price
per 
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Unico Unico 22120100109 Lustre A22 Trunks Color 00-White
Regular Price
¥3,800
Sale Price
¥3,800
Regular Price
¥4,500
Unit Price
per 
Save 15%
Unico Unico 22120100101 Cristalino A22 Trunks Color 00-White
Regular Price
¥3,400
Sale Price
¥3,400
Regular Price
¥4,000
Unit Price
per 
Save 14%
Unico Unico 22110100101 Naviero Trunks Color 29-White
Regular Price
¥4,200
Sale Price
¥4,200
Regular Price
¥4,900
Unit Price
per 
Save 15%
Unico Unico 22100100203 Senda Boxer Briefs Color 82-Dark Blue
Regular Price
¥4,100
Sale Price
¥4,100
Regular Price
¥4,800
Unit Price
per 
Save 16%
Unico Unico 22100100103 Senda Trunks Color 82-Dark Blue
Regular Price
¥3,800
Sale Price
¥3,800
Regular Price
¥4,500
Unit Price
per 
Save 16%
Unico Unico 22120100102 Profundo A22 Trunks Color 82-Dark Blue
Regular Price
¥3,800
Sale Price
¥3,800
Regular Price
¥4,500
Unit Price
per 
Save 35%
Unico Unico 22120201107 Intenso M22 Briefs Color 99-Black
Regular Price
¥2,600
Sale Price
¥2,600
Regular Price
¥4,000
Unit Price
per 
Save 33%
Unico Unico 22110201103 Astros Briefs Color 90-Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per