This ultra-soft silk sleep mask in Slip's Yacht Club print brings a touch of seaside luxury, with a contoured design that keeps lashes free to flutter. This ultra-soft silk sleep mask in Slip's Yacht Club print brings a touch of seaside luxury, with a contoured design that keeps lashes free to flutter. 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.