Knees Up is a metallic true red, and trust me when I say that photos don’t do it justice. I got a mini bottle to try for this review and audibly gasped when it arrived on my doorstep. It’s truly Christmas in a bottle. The metallic, mid-tone red is merry and bright but not in an over-the-top way. After filing, shaping, and prepping my nails, I applied a thin layer of base coat and let it dry completely before going in with polish. Butter London’s polishes are some of the most pigmented I’ve tried, and many shades — including this one — are nearly opaque after just a single coat. However, if you want to ensure a 100% streak-free finish, two will get you there. Last step, swipe some top coat on (I use the Olive & June one) to seal your work.