A Week To Remember Stay on top of your week. CheapUndies proudly presents the “Day of the Week” Briefs and trunks, a collection that lets you pull on a different pair of silky-soft modal undies from Monday to Sunday. Featuring each day proudly emblazoned on the waistband, these colorful briefs give you one less thing to worry about each morning. Of course, you could always be a joker and wear your “Friday” brief on Monday, thus plunging the entire universe into chaos. We’ll leave that up to you.