ITEM INCLUDING: 5 Pairs of Baby Girl Boy Socks a set SIZE: ?S: 0-12 months infant, Feet Length: 2.3-4.4in/6-11cm ?M: 1-3 years Toddler, Feet Length: 4.7-5.5in/12-14cm ?L: 3-5 years Little kids, Feet Length: 5.9-6.3in/15-16cm ANTI-SLIP GRIP DESIGN: Our baby non-skid ankle socks are covered with substantial nonskid strong grips on the bottom. The strong silicone grips can provide enough friction so baby will not slip on hard floor or other smooth surface when walking, crawling or playing.