The Smartwool Mens Merino Sport 150 Brief takes all of the tech you love from their Merino boxer briefsa lightweight feel, breathability, anti-stink Merinoand adds a looser fit. With a fully functional fly and a wide, Merino-lined elastic waistband, youll experience maximum comfort all day long. No matter if youre hitting the trail for a three-day camping trip or trying new sports, our Mens Merino 150 Boxer brings you the performance and comfort you can expect from our ultra-soft, responsibly sourced Merino wool.