This multi-functional, long wear, water resistant eyebrow pencil allows for customisable definition. The fine-tip applicator creates natural hair-like strokes yet allows for a full, bold brow look with a blend-able, non-clumping formula. How do I know which Hi-Def Brow Pencil shade works best for me? Soft Brown – For blonde to light brown hair, with warm or cool undertones. Cool Brown – For medium to dark hair with cool/ash undertones. Warm Brown– For medium to dark hair with warm/gold undertones.