Two adjustable snaps keep the booties in place and allow them to shape nicely to the contours of your baby's feet. The gripper bottoms are designed to help new walkers grip slippery floors when starting to take their first steps. With an ultra soft fleece exterior lined with 100% cotton, these booties are sure to keep baby's feet warm and protected. 70% Polyester, 30% Cotton Machine Washable Size 3 months