You will find these compression shorts comfortable to wear under your Gi. MMA Shorts or whatever you train and fight in! Versatile compression short with unique BioFlex cup Supportive 4-way stretch. anti-microbial fabric wicks away moisture BioFlex cup includes vented bio-shape body and gel perimeter pad X-Fit cup retention system provides closer. more comfortable fit Interlocking flat seams; ventilated inside cup pocket; comfort fit waistband Sizes: Small 27-29" Waist Medium 30-32" Waist Large 33-35" Waist XL 36-40" Waist Due to the nature of this product we are unfortunately unable to accept returns.