Upgrade your beauty sleep with Slip's ultra-smooth, queen-sized silk pillowcase—designed for a gentle, friction-reducing snooze. Upgrade your beauty sleep with Slip's ultra-smooth, queen-sized silk pillowcase—designed for a gentle, friction-reducing snooze. 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.