Stay warm and dry on the coldest days outdoors with the Under Armour Extreme Base Bottom. The cozy 95% polyester, 5% wool shell is lined with high-pile fleece for superior next-to-skin comfort. UA Scent Control technology traps and suppresses odor-causing bacteria, keeping you difficult to detect in the field. ColdGear Infrared technology – a soft, thermo-conductive coating on the interior – absorbs and retains your body heat for added warmth without excess weight or bulk. Strategic stretch panels offer increased ease of movement and ensure the perfect fit. Fitted design. Imported.