At BreathableBaby, safety is first, last, and everything in between. That's why we have invested countless hours into medical and scientific research to make our products safer. We invented and perfected the breathable mesh liner. Too many babies get their arms or legs stuck in between slats. So we created the mesh liner to simply and safely solve the problem. The original mesh liner with millions sold since 2002. BreathableBaby's mesh liners are available in collections for every price point and style. The AirflowBaby by BreathableBaby Essential Collection provide a cost-effective solution to help keep arms and legs inside and is available in a limited range of colors and sizes. For enhanced features and benefits, select liners from the BreathableBaby Classic or Deluxe Collection. Mesh liners from the Classic Collection help prevent entrapment and are available in the widest range of colors and sizes. Mesh liners from the Deluxe Collection help prevent entrapment and are thicker to help prevent bumps and bruises. Deluxe mesh liners have upgraded fashions to fit a variety of nursery settings, but have limited size options. For help selecting a liner, contact customer care. SAFETY TESTED & TRUSTED: From BreathableBaby, the original, mesh liner with millions sold since 2002. Independently tested to meet or exceed relevant safety standards. Contains no harmful chemicals, flame retardants or formaldehyde. SAFE ALTERNATIVE TO CRIB BUMPER: Helps prevent arms and legs from getting caught between slats. Unlike crib bumpers, a single layer of breathable mesh allows exhaled air to pass through the fabric and mitigates the risk of carbon dioxide rebreathing. FITS MINI/PORTABLE STYLES WITH A 38" x 24" (97 CM x 61 CM) MATTRESS: Install long panel 11"H x 127"L (28 cm x 323 cm) to cover 4 sides. For use on four-sided slatted mini/portable cribs only. Do not use with two-sided or solid back portable/mini cribs. 3 MM CLASSIC MESH WITH POLYESTER TRIM: Constructed from 3 mm Classic Mesh with A.C.T. Air Channel Technology. Light blocking rating of >85%. 100% polyester mesh. 1" (2.54 cm) polyester trim on top and bottom. EASY TO INSTALL: Adjusts to fit with hook and loop. Always install the bottom edge 1" (2.54 cm) below the top of the mattress and secure all fastenings before use. Review instruction manual and installation video or contact customer care for assistance.