1. Thi cotton sos with terry cloth lining: Made of high-quality skin-friendly cotton, soft terry covers the entire so, super soft and comfortable, keeps little feet warm and comfortable in cold weather2. Elastane not only ensures a good fit, but also keeps the fit as baby's feet grow. They are elastic and not too tight, so you don't have to worry about leaving marks on your baby's chubby ankles and feet.3. Rolled cuff design: ANKLE or CREW sos, it depends on your needs and preferences. If the cuffs are unfolded, they will keep your baby's caes warm and less likely to slip, and they are usually high in the middle of the calf, depending on the size of your baby's feet.4. The large-area non-slip grip can protect the safety of the baby, especially suitable for ldren who like to run, skateboard and jump at e. Also suitable for babies learning to walk or crawl.