Summer Fridays' Marianna Hewitt and Lauren Ireland Share Their Must Haves

Ireland's secret weapon for an amazing hair day isn't a hot tool or styling product but rather the Kitsch Satin Pillowcase ($19, originally $23), which is available on Amazon. "It is so good for hair and skin health," Ireland says. The biggest benefit of sleeping on a satin pillowcase is preventing frizz and damage to the hair, which can be a result of friction from the fabric as you move in your sleep.

Pro Tip: Satin pillowcases are gentler not just on your hair but on your skin as well. Washing your pillowcases weekly can also make a big difference in improving your skin.