Rib-knit cuffs. Soft-knit fabric, with comfortable stretch. Notched seams at toe and heel for added comfort. Textured logos at soles. These socks are totally cozy and unisex, too. Wearable & shareable for him, for her, for them. Size 0-6M = 19-27 height, 7-17 lbs. weight. Size 6-12M = 27-29 height, 17-22 lbs. weight. Size 12-24M = 29-33 height; 22-30 lbs. weight. Size 2T-3T, Height 33-39, Weight 30-36 lbs. Size 4T-5T = 39-45 height 36-46 lbs. weight. machine wash according to the care instruction label