Callahan X REVOLVE Turtleneck Sweater in Purple. - size XS (also in ) Callahan X REVOLVE Turtleneck Sweater in Purple. - size XS (also in ) 60% cotton 40% acrylic. Hand wash cold. Foldover neckline. Side seam slits. Rib knit fabric. Imported. CAHN-WK68. TURTLENECK. Los Angeles based brand Callahan is known for their comfy sweaters and perfect boyfriend fits. Their line is elevated by unique textures, materials, and techniques that give each piece versatility and wearability. Designed for cool girls everywhere, Callahan is inspired by effortlessly easy style.