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The MASS21 No Show Active Trunk gives your package, butt and confidence a boost!About Feature1)Supportive elastic waistband for a secure fit Fashion look with "MASS21" logo printed Breathable Contoured Pouch with contrast colorMicro-perforated mesh insets at sides of pouch for ventilation,breathableSmooth rear coverage,comfort fit for wearing all day and great for gym wearingMen's Underwear Size Chart: US Size XS/Asian S :Fits Waist 25-27 inches US Size S/Asian M: Fits Waist 27-29 inches US Size M/Asian L: Fits Waist 29-31 inches US Size L/Asian XL:Fits Waist31-33 inches US Size XL/Asian XXL:Fits Waist 33-35 inches Attention:do not use the Amazon Size Chart,just follow our size chart detailCustomer ServiceIf you have any problem about size,for example, it is too small to you,remember to contact MASS21,we will be always here to at your disposal!