Shop Toddlers's at RalphLauren.com, the Official Site of Ralph Lauren. Siera II EZ Sneaker - Our comfortable Siera II slip-on sneaker is crafted from durable cotton canvas and features sporty stripes and our signature embroidered Big Pony. Rounded-toe silhouette. Slip-on styling. Elastic side gores ensure easy on and off. Padded collar. Two vertical stripes accent the outer side. Rubber "Polo" tag at the heel. Padded insole. Treaded rubber outsole. Our signature embroidered Big Pony accents the toe. Cotton. Imported.