Rallying the trail all day doesn't have to come at the cost of rallied sit bones -- that's what Giro crafts the Base Liner Shorts for. These lightweight and breathable liner shorts fit snug, like your favorite boxer briefs, but unlike your favorite boxer briefs these shorts are loaded with a multi-density pad that takes the sting out of rough and rowdy trails. Breathability is a top priority on the Base Liner Shorts, with a combination of panels of polyester and spandex that actively pull away moisture, and mesh panels that let cool air in to keep you comfortable. To make things a little bit easier on you when nature calls, Giro equips these shorts with a fly opening.