This product is waterproof, which is very handy during summer.
From Selfridges
Bobbi Brown Mahogany Perfectly Defined Long-wear Brow Pencil 1.15g
Lookfantastic
Bobbi Brown Perfectly Defined Long-Wear Brow Pencil (Various Shades) - Mahogany
Selfridges
Bobbi Brown Brown Perfectly Defined Long-Wear Brow Pencil