Supported by a fail-proof steel frame, the Chelsea Compact Steel Non-Folding White Crib features classic slats on the two side panels and clear panels on each end for a completely unobstructed view of baby. These clear ends make it a fantastic choice for use in daycares or nurseries. The frame features 360 degree welds and a powder-coated finish for a non-porous surface with fewer places for bacteria to thrive. A reinforced mattress support system is adjustable to two heights and a 3-inch DuraLoft heavy-duty mattress is included. This crib rests on four 2-inch casters, two of which lock so it's easy to move when you want to but won't budge when you don't. Change out the 2-inch casters for 4-inch casters (sold separately) to make it a certified evacuation crib. With 4-inch casters, daycare providers could put several babies in one crib and evacuate them quickly in case of an emergency. Assembly instructions are permanently affixed so you'll never lose them.