The Arc'teryx Rho LT Bottom is your lightweight thermal baselayer for low and medium output when its cold out. The odor-resistant Torrent fabric has a soft, brushed surface that speeds moisture transfer and delivers serious comfort next to the skin. Elastane fibers add stretch and work with the articulated patterning and gusseted crotch for freedom of movement. The waistband is designed for comfort and easy layering, and a smart thigh pocket stashes a smartphone. Updated with a resized side pocket that accommodates a smartphone and a more comfortable trim fit.