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.

Save 36%
Xtremen Xtremen 41313 Printed Briefs Color Royal
Regular Price
¥1,400
Sale Price
¥1,400
Regular Price
¥2,200
Unit Price
per 
Save 17%
Xtremen Xtremen 41313 Printed Briefs Color Orange
Regular Price
¥2,000
Sale Price
¥2,000
Regular Price
¥2,400
Unit Price
per 
Xtremen Xtremen 91130 Printed Jockstrap Color Orange
Regular Price
¥800
Sale Price
¥800
Regular Price
¥0
Unit Price
per 
Save 17%
Xtremen Xtremen 41313 Printed Briefs Color Green
Regular Price
¥2,000
Sale Price
¥2,000
Regular Price
¥2,400
Unit Price
per 
Save 33%
Xtremen Xtremen 91130 Printed Jockstrap Color Green
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
Save 34%
Roger Smuth Roger Smuth RS077 Thongs Color White
Regular Price
¥3,800
Sale Price
¥3,800
Regular Price
¥5,800
Unit Price
per 
Save 15%
Roger Smuth Roger Smuth RS077 Thongs Color Burgundy
Regular Price
¥5,500
Sale Price
¥5,500
Regular Price
¥6,500
Unit Price
per 
Save 33%
Roger Smuth Roger Smuth RS072 Trunks Color Black
Regular Price
¥1,600
Sale Price
¥1,600
Regular Price
¥2,400
Unit Price
per 
Save 14%
ErgoWear ErgoWear EW1166 X4D Bikini Color White
Regular Price
¥4,900
Sale Price
¥4,900
Regular Price
¥5,700
Unit Price
per 
Save 16%
ErgoWear ErgoWear EW1167 X4D Trunks Color White
Regular Price
¥5,200
Sale Price
¥5,200
Regular Price
¥6,200
Unit Price
per 
Save 14%
ErgoWear ErgoWear EW1162 X4D Bikini Color Stonewash
Regular Price
¥4,900
Sale Price
¥4,900
Regular Price
¥5,700
Unit Price
per 
Save 16%
ErgoWear ErgoWear EW1163 X4D Trunks Color Stonewash
Regular Price
¥5,200
Sale Price
¥5,200
Regular Price
¥6,200
Unit Price
per 
Save 14%
ErgoWear ErgoWear EW1158 X4D Bikini Color Burgundy
Regular Price
¥4,900
Sale Price
¥4,900
Regular Price
¥5,700
Unit Price
per 
Save 16%
ErgoWear ErgoWear EW1159 X4D Trunks Color Burgundy
Regular Price
¥5,200
Sale Price
¥5,200
Regular Price
¥6,200
Unit Price
per 
Save 35%
ErgoWear ErgoWear EW1160 X4D Boxer Briefs Color Burgundy
Regular Price
¥4,800
Sale Price
¥4,800
Regular Price
¥7,400
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Yellow
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Wine
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Turquoise
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Royal Blue
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Red
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Purple
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Pink
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Opal Green
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Neon Green
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Navy
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 15%
JUSTIN+SIMON JUSTIN+SIMON XSJ22 Cheek Briefs Color Metal Green
Regular Price
¥3,300
Sale Price
¥3,300
Regular Price
¥3,900
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Hot Pink
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Gray
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Coral
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per 
Save 14%
JUSTIN+SIMON JUSTIN+SIMON XSJ08 Classic Trunks Color Black
Regular Price
¥3,100
Sale Price
¥3,100
Regular Price
¥3,600
Unit Price
per