Belabumbum Serena Wireless Spacer Nursing Bra (MATSA10). This wireless nursing bra features contour spacer foam cups for breathable comfort. Made of silky polyamide/elastane. Soft; wireless contour cup provides modesty. Spacer foam cup is breathable and very thin Plastic clasps are convenient so you can open or close with one hand. Stretch inner lace tops the breasts. Back coated hook-and-eye closures accommodate your fluctuating size during nursing. See Fitter's Comments below for count. Nursing/Maternity Bra Basics: What's the difference between a maternity bra and a nursing bra? When should you buy these bras? Tomima answers your questions and provides special tips on how; when and why to buy nursing/maternity bras. Please Note: This style is no longer produced in Black in size 34D/E. Measure yourself just 3 weeks before your due date to find your optimal nursing bra size.