After chemo, my thick eyebrows grew back in much sparser than before. And fluctuating hypothyroidism makes me lose the ends of my eyebrows when it gets too low even on medication. I've tried every kind of eyebrow pencil and powder there is. Last Christmas, my daughter treated me to a Smashbox makeover, and the makeup artist used Brow Tech To Go on my brows. They looked fantastic! I love how I can make the ends of my brows look so great with a sweep of the angled tip. Filling them in took a little more practice, but I now have it down. I also love how it lasts all day, and even looks great when I get caught in the rain. I keep one at home and one in my purse at all times.