Tracked by Evreward since 2016, Saxx Underwear offers coupons, cash back rebates and rewards, with savings as high as 50% off. Saxx Underwear discount coupons are somehwat rare, available a few times each year. Even when Saxx Underwear doesn't have a coupon, you can always get up to 16% cash back, and other great rewards, with every purchase.