A subtle blue micro-check adorns our 100% cotton boxers. Built for comfort, durability and a crisp wear, our signature straight fit is 10 years in the making. Featuring a stretch waistband, button fly and rear gusset. Ideal for everyday wear. SIRPLUS started on a market stall 10 years ago selling boxers made from shirting off cuts - and still true to to our roots, these boxers are made from surplus cotton fabric.