A girls' spa day is the perfect time to put on a hair mask and relax as you let all of the treatments soak in and do their job. To undo damage, try It's a 10 Potion 10 Miracle Repair Hair Mask, $36.96. This mask smooths split ends and leaves hair shiny and healthy to the touch . It comes in the most convenient flip-top container, making application a breeze if you're juggling multiple spa treatments at once.

Another great option is DHC Q10 Revitalizing Hair Care Deep Repair Mask, $20, which makes hair feel so soft and healthy without weighing it down. This mask is ideal for colored or heat-styled hair.