410 Casual Non-Weighted Foam Classic Breast Form is ultra light, cool and comfortable, and ideal for the first six to eight weeks after surgery. It is also great for sleeping, relaxing, swimming, and exercising. Made of soft, polyurethane foam and covered with a polyester fabric cover, it is extremely lightweight but also durable and puncture proof. A security tab on the permanent fabric cover can be sewn to a bra or bathing suit cup. 410 is asymmetrical in shape.