The KicKee Pants Footie with zipper is a wardrobe must have and has a snug fit. The inside of the foot is lined with super soft fleece to keep baby's feet warm and the bottom of the foot features grippers to avoid slipping. Made from 95% Viscose from bamboo and 5% spandex...the feel of this fabric is beyond amazing! Not treated with flame retardant Layette (Classic) Fit: Preemie through 6-9 months