Callahan Nova Top in Green. - size L (also in M, S, XS) Callahan Nova Top in Green. - size L (also in M, S, XS) 70% acrylic 27% nylon 3% elastane. Imported. Hand wash recommended. Halterneck tie. Fuzzy knit fabric. CAHN-WK149. CAHN-WK149. 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. Shop the latest in fashion from Callahan