Curvy Kate Smoothie Spacer T-Shirt Bra (CK2104). The Curvy Kate Smoothie Spacer T-Shirt Bra CK072104 has an ultra lightweight feel with airflow-promoting padded cups and smoothing sides with slings inside cups for forward projection. Curvy Kate's Smoothie Spacer T-Shirt Bra is made of polyester/polyamide/elastane.