Chestnut Brown (#6) Hair Extensions: Chestnut Brown color is on the medium side in the brown color palette available on our website. The chestnut brown color has a light red highlight undertone. It’s considered as a medium soft shade of brown. The quality of our hair extensions will make you forget that it’s not your own hair. Buy quality chestnut brown hair extensions at low prices on Canada Hair: your #1 destination for hair extensions!