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About MASS21 Active Boxer BriefsMade from a breathable,moistur-wicking fabric,the MASS21 Ultimate Mesh Performance Boxer Briefs respond to your body temperature to keep you cool and dry,thanks to its revolutionary cooling technology.Get the most bang for your buck,stock with this 3-pack!About Feature1.Lightweight fabric enhances ventilation and breathability2.Classic fit boxer briefs featuring logo printed waistband for all day lasting comfort3.No ride up legs designed to stay in place,you do not have trouble for "ride up" any more4.Flat-lock stitching to reduce irritation caused by chafing5.Ultra soft premium fabric that holds shape through wash6.Smooth rear coverage,comfort fit,it is great for gym wearingMen's Underwear Size Chart:Size S :Fits Waist 26-29 inches Size M: Fits Waist 29-33 inches Size L: Fits Waist 33-37 inches Size XL:Fits Waist 37-40 inches Size XXL:Fits Waist 41-45 inchesAttention: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!