As Pop Sugar notes, model turned businesswoman Rosie Huntington-Whiteley swears by silk scrunchies to protect her hair and prevent unnecessary breakage. Huntington-Whiteley's chosen brand, Slip's Slipsilk Scrunchies, retail for $39 for a three-pack from Sephora, and judging by how good her hair looks, they're a worthy investment. The luxurious hair ties reportedly "cause no dents, pulling, or damage," so they're ideal for regular wear as well as to sleep in. Silk scrunchies have been a celebrity staple for a while now. As Shape notes, Huntington-Whiteley's favorites are designed by the same company that makes the miracle silk pillowcases that reportedly fight against ageing and frizz. 

Their scrunchies are "made from 100 percent pure mulberry silk, meaning they are gentle on your tresses and won't leave you with annoying creases." Shape suggests cleaning them regularly but never putting the scrunchies in the washing machine, presumably to keep them silky smooth. Kim Kardashian is another famous fan of Slip's silk scrunchies, gushing, "I love these hair ties. They're the new scrunchies that I'm using all the time," in an Instagram story, according to People. Her mother, Kris Jenner, and sisters Kendall and Kylie Jenner are reportedly converts as well. Considering all of these famous ladies are known for their gorgeous hair, maybe silk scrunchies really are the way to go.