The multi award-winning slip skinnies are the perfect size for everyday use and won't leave creases in your delicate hair. The multi award-winning slip skinnies are the perfect size for everyday use and won't leave creases in your delicate hair. Proudly Australian and family-owned, Slip is renowned for its luxurious silk pillowcases and beauty products, crafted from the finest quality silk to elevate beauty sleep and minimize friction on skin and hair.