Barsty Men's Breathable Underwear Hollow U Convex Sexy Briefs Material:92%Lenzing Modal 8%polyurethane fibre Asian size M/US S :Waistline-26"(-30'' stretch ) Asian size L/US M : Waistline-28"(-31.5'' stretch ) Asian size XL/US L :Waistline-30"(-33.5'' stretch ) The trousers don't curl and shrink High-elastic,Supersoft,Cloest skin,Moisture absorption Due to health regulations, we regret to inform you that we cannot accept returns on intimate apparel. Only defective product will be offered exchange or refund.Please check the Size Chart in the image area Before you place the order. Please allow slight deviation for the measurement data.