The Crocs Shoes Crocling is one of the most comfortable and versatile shoes your child will ever wear. It features a secure-fit, antimicrobial, odor-resistant upper designed especially for active kids. Soft neoprene upper includes a footbed that conforms to your child's foot for a custom fit. Circulation nubs stimulate blood flow. Ventilation ports increase breathability and filter water and debris away from the footbed. Ventilation holes also accommodate Jibbitz™ brand charms.